Accounting
Anthropology
Archaeology
Art History
Banking
Biology & Life Science
Business
Business Communication
Business Development
Business Ethics
Business Law
Chemistry
Communication
Computer Science
Counseling
Criminal Law
Curriculum & Instruction
Design
Earth Science
Economic
Education
Engineering
Finance
History & Theory
Humanities
Human Resource
International Business
Investments & Securities
Journalism
Law
Management
Marketing
Medicine
Medicine & Health Science
Nursing
Philosophy
Physic
Psychology
Real Estate
Science
Social Science
Sociology
Special Education
Speech
Visual Arts
Question
Sarah is the office manager for a group of financial advisors who provide financial services for individual clients. She would like to investigate whether a relationship exists between the number of presentations made to prospective clients in a month and the number of new clients per month. The following table shows the number of presentations and corresponding new clients for a random sample of six employees.| Employee | Presentations | New Clients |
| 1 | 7 | 2 |
| 2 | 9 | 3 |
| 3 | 9 | 4 |
| 4 | 10 | 6 |
| 5 | 11 | 5 |
| 6 | 14 | 4 |
Calculate the sample covariance.
Answer
This answer is hidden. It contains 0 characters.
Related questions
Q:
The following contingency table shows the number of customers who bought various brands of inkjet printers and their gender.Printer BrandMenWomenHP3021Canon186Epson96Brother33Other2430The probability that a randomly selected customer from this sample bought a Canon printer or a Brother printer is ________.
Q:
The following table shows the range of math SAT scores for the incoming freshman class of business students at Smith University.Math SAT ScoresNumber of Students350 to under 40040400 to under 45098450 to under 500106500 to under 55065550 to under 60017Determine the probability that a randomly selected student from this incoming class scored 400 or higher.
Q:
A multiple choice test has 12 questions, with each question having five choices. The number of different ways a student can answer the 12 questions is ________.
A) 128
B) 480
C) 792
D) 95,040
Q:
The standard deviation of a data set can never be negative.
Q:
Measures of variability show how much spread is in your data.
Q:
The MODE.SNGL function in Excel will correctly identify more than one mode in a data set.
Q:
When the index point, i, is not a whole number, round i up to the next highest whole number to find the position of the median in a sorted data set.
Q:
Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the table below.SalesPrice8$124$115$109$98$88$77$6Calculate the sample correlation coefficient.
Q:
Costco sells paperback books in their retail stores and wanted to examine the relationship between price and demand. The price of a particular novel was adjusted each week and the weekly sales were recorded in the table below.SalesPrice8$124$115$109$98$88$77$6Calculate the sample covariance.
Q:
The following data represents the amount of money that individuals spent on gifts for Mother's Day.$110 $132 $144 $168 $141 $100 $184 $137 $134 $148 $128 $166Determine the five-number summary for this data.
Q:
The following data represents the amount of money that individuals spent on gifts for Mother's Day.$110 $132 $144 $168 $141 $100 $184 $137 $134 $148 $128 $166Construct a box-and-whisker plot for this data.
Q:
The following data represent the square footage of 10 three-bedroom condos for sale in Hilton Head, South Carolina.1,559 1,625 1,167 1,264 1,6761,300 2,058 1,126 1,858 1,321Determine the 80th percentile of this sample.
Q:
The following contingency table shows the number of adults with credit scores 725 or above and below 725 as well as their marital status.Credit ScoreSingle (C)Married (D)Below 725 (A)3933725 or above (B)1563Identify the joint probabilities for this table.
Q:
The following contingency table shows the number of adults with credit scores above and below 725 as well as their marital status.Credit ScoreSingle (C)Married (D)Below 725 (A)3933725 or above (B)1563Determine whether Events A and C are independent or dependent. What conclusions can be made?
Q:
Avalon Bagel provides take-out service for a variety of breakfast items. The following table shows the number of orders that have been recently placed grouped by the size of the order in dollars.Size of OrderNumber of orders$0 to under $510$5 to under $1012$10 to under $1514$15 to under $205$20 to under $259What is the approximate average order size for this sample?
Q:
Suppose the employees' share of annual health care costs for 2012 is thought to be bell-shaped and symmetrical with a mean of $2,764 and a standard deviation of $426. Based in this information, what interval of annual health care costs would we expect approximately 95% of employees to fall within?
Q:
Bruce sells timeshares at a resort in Orlando, Florida. The data below represents the number of units Bruce has sold per month over the past eight months.4 11 7 2 13 6 6 10Calculate the z-score for a month when Bruce sold 4 timeshare units.
Q:
The following data shows the number of minutes that seven customers waited for a table at a particular restaurant.1 17 26 10 5 22 19 8Calculate the coefficient of variation for this data.
Q:
The following data represent the number of minutes eight taxpayers waited on hold for when calling into the IRS help line.16 18 1 17 2 1 16 19Describe the shape of this distribution as symmetrical, left-skewed, or right-skewed.
Q:
The following data represent the time between customer arrivals, in minutes, at a drive-thru for a fast food restaurant.2 4 1 0 6 4 1 2 5 3Determine the mode of this data set.
Q:
The following data represent a sample of games won per season by the San Francisco 49ers of the National Football League over an eight-year period.13 6 8 7 5 7 4 2Calculate the median of this sample.
Q:
A survey of Americans ages 18-24 years old found the following political party affiliations.PartyPercentageIndependent50%Democratic30%Republican20%Consider the following information:"¢ Of those affiliated with the Independent party, 56% were male."¢ Of those affiliated with the Democratic party, 40% were male."¢ Of those affiliated with the Republican party, 35% were male.Use Bayes' Theorem to determine the probability that a person who is male is affiliated with the Independent party.
Q:
A survey asked business travelers if they worked harder on a business trip. Fifty percent of the respondents were younger than 45 years and 50% where 45 years or older. Sixty-four percent of the younger respondents indicated they did work harder on business trips while 30% of the older respondents indicated they worked harder on business trips. Given that the respondent indicated he/she worked harder on business trips, use Bayes' Theorem to determine the probability that the person is younger than 45 years old.
Q:
Consumer Reports would like to conduct a hypothesis test to determine if the average battery life for an iPad is different from the average battery life for a Kindle Fire. The following data represents the battery life from a random sample of iPads and Kindle Fires in hours. Assume that the population variances are equal. iPad9587891111Kindle109109121010 Define Population 1 as iPads and Population 2 as Kindles and use the critical value approach to test this hypothesis with = 0.02.
Q:
The Wall Street Journal reported that there is evidence that Mac users are shown more expensive hotel prices when using Orbitz than PC users. Perform a hypothesis test to determine if the average hotel price for Mac users on Orbitz is higher than for PC users. The following data summarizes the sample statistics for hotel prices provided to each type of user from Orbitz. Assume that the population variances are equal. MacPCSample mean$145$116Sample size2017Sample standard deviation$35$32 Define Population 1 as Mac users and Population 2 as PC users. Construct a 98% confidence interval for the difference in population mean and interpret the results.
Q:
Traveler's Insurance would like to test the hypothesis that the average number of miles driven per month by a male teenage driver exceeds the average number of miles driven per month by a female teenage driver by more than 50 miles. The following data summarizes the sample statistics for the miles driven per month by each gender. Assume that the population variances are equal. MaleFemaleSample mean685580Sample size1316Sample standard deviation130120 Define Population 1 as male drivers and Population 2 as female drivers. Construct a 90% confidence interval for the difference in population mean and interpret the results.
Q:
A local Chamber of Commerce would like to test the hypothesis that the average monthly rent for a one-bedroom apartment in York is different from the average rent of a one-bedroom apartment in Lancaster. The following data summarizes the sample statistics for one-bedroom apartment rents for both locations. Assume that the population variances are equal. LancasterYorkSample mean$830$770Sample size1418Sample standard deviation$75$65 Define Population 1 as Lancaster apartments and Population 2 as York apartments. Construct a 95% confidence interval for the difference in population mean and interpret the results.
Q:
Edmunds.com would like to test the hypothesis that the average age of an imported car on the road is greater than the average age of a domestic car. The following data shows the sample size and the average age of cars for import and domestic cars along with the population standard deviations. DomesticImportSample mean9.4 years10.8 yearsSample size3336Population standard deviation3.2 years2.8 years Define Population 1 as import cars and Population 2 as domestic cars and use the p-value value approach to test this hypothesis with = 0.05.
Q:
AT&T would like to test the hypothesis that the proportion of 18- to 34-year-old Americans that own a cell phone is less than the proportion of 35- to 49-year-old Americans. A random sample of 200 18- to 34-year-old Americans found that 126 owned a smartphone. A random sample of 175 35- to 49-year-old Americans found that 119 owned a smartphone. If Population 1 is defined as 18- to 34-year-old Americans and Population 2 is defined as 35- to 49-year-old Americans, the 98% confidence interval for the difference in population proportions is ________.A) (0.039, 0.061)B) (0.011, 0.089)C) (-0.164, 0.064)D) (-0.122, 0.222)
Q:
Progressive Insurance would like to test the hypothesis that a difference exists in the proportion of students in 12th grade who text while driving when compared to the proportion of 11th grade drivers who text. A random sample of 160 12th grade students found that 84 texted while driving. A random sample of 175 11th grade students found that 70 texted while driving. If Population 1 is defined as 12th grade drivers and Population 2 is defined as 11th grade drivers, and using = 0.05, which one of the following statements is true?A) Because the p-value is less than , Progressive Insurance can conclude that a difference exists in the proportion of students in 12th grade who text while driving when compared to the proportion of 11th grade drivers who text.B) Because the p-value is greater than , Progressive Insurance can conclude that a difference exists in the proportion of students in 12th grade who text while driving when compared to the proportion of 11th grade drivers who text.C) Because the p-value is less than , Progressive Insurance cannot conclude that a difference exists in the proportion of students in 12th grade who text while driving when compared to the proportion of 11th grade drivers who text.D) Because the p-value is greater than , Progressive Insurance cannot conclude that a difference exists in the proportion of students in 12th grade who text while driving when compared to the proportion of 11th grade drivers who text.