>LCPO< FUND OF STATISTICS
5th Edition
ISBN: 9781034509998
Author: Sullivan
Publisher: PEARSON
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Chapter 9.1, Problem 53AYU
To determine
To find: The incorrect confidence interval.
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A marketing professor has surveyed the students at her university to better understand attitudes towards PPT usage for higher education. To be able to make inferences to the entire student body, the sample drawn needs to represent the university’s student population on all key characteristics. The table below shows the five key student demographic variables. The professor found the breakdown of the overall student body in the university’s fact book posted online.
A non-parametric chi-square test was used to test the sample demographics against the population percentages shown in the table above. Review the output for the five chi-square tests on the following pages and answer the five questions:
Based on the chi-square test, which sample variables adequately represent the university’s student population and which ones do not? Support your answer by providing the p-value of the chi-square test and explaining what it means.
Using the results from Question 1, make recommendation for…
A marketing professor has surveyed the students at her university to better understand attitudes towards PPT usage for higher education. To be able to make inferences to the entire student body, the sample drawn needs to represent the university’s student population on all key characteristics. The table below shows the five key student demographic variables. The professor found the breakdown of the overall student body in the university’s fact book posted online.
A non-parametric chi-square test was used to test the sample demographics against the population percentages shown in the table above. Review the output for the five chi-square tests on the following pages and answer the five questions:
Based on the chi-square test, which sample variables adequately represent the university’s student population and which ones do not? Support your answer by providing the p-value of the chi-square test and explaining what it means.
Using the results from Question 1, make recommendation for…
A retail chain is interested in determining whether a digital video point-of-purchase (POP) display would stimulate higher sales for a brand advertised compared to the standard cardboard point-of-purchase display. To test this, a one-shot static group design experiment was conducted over a four-week period in 100 different stores. Fifty stores were randomly assigned to the control treatment (standard display) and the other 50 stores were randomly assigned to the experimental treatment (digital display). Compare the sales of the control group (standard POP) to the experimental group (digital POP).
What were the average sales for the standard POP display (control group)?
What were the sales for the digital display (experimental group)?
What is the (mean) difference in sales between the experimental group and control group?
List the null hypothesis being tested.
Do you reject or retain the null hypothesis based on the results of the independent t-test?
Was the difference between the…
Chapter 9 Solutions
>LCPO< FUND OF STATISTICS
Ch. 9.1 - A _____ _____ is the value of a statistic that...Ch. 9.1 - The _____ ___ _____ represents the expected...Ch. 9.1 - True or False: A 95% confidence interval for a...Ch. 9.1 - The value z2 represents the of the distribution.Ch. 9.1 - As the level of confidence of a confidence...Ch. 9.1 - As the sample size used to obtain a confidence...Ch. 9.1 - In Problems 710, determine the critical value z/2...Ch. 9.1 - In Problems 710, determine the critical value z/2...Ch. 9.1 - In Problems 710, determine the critical value z/2...Ch. 9.1 - In Problems 710, determine the critical value z/2...
Ch. 9.1 - In Problems 1114, determine the point estimate of...Ch. 9.1 - In Problems 1114, determine the point estimate of...Ch. 9.1 - In Problems 1114, determine the point estimate of...Ch. 9.1 - In Problems 1114, determine the point estimate of...Ch. 9.1 - In Problems 1520, construct a confidence interval...Ch. 9.1 - In Problems 1520, construct a confidence interval...Ch. 9.1 - In Problems 1520, construct a confidence interval...Ch. 9.1 - In Problems 1520, construct a confidence interval...Ch. 9.1 - Prob. 19AYUCh. 9.1 - In Problems 1520, construct a confidence interval...Ch. 9.1 - NW You Explain It! New Deal Policies In response...Ch. 9.1 - Prob. 22AYUCh. 9.1 - You Explain It! Valentines Day A Rasmussen Reports...Ch. 9.1 - Prob. 24AYUCh. 9.1 - NW Giving Blood A survey of 2306 adult Americans...Ch. 9.1 - Saving for Retirement? A Retirement Confidence...Ch. 9.1 - Luxury or Necessity? A random sample of 1003 adult...Ch. 9.1 - Family Values In a USA Today/Gallup poll, 768 of...Ch. 9.1 - Prob. 29AYUCh. 9.1 - Reading In a survey of 700 community college...Ch. 9.1 - Phone in the John In a survey conducted by the...Ch. 9.1 - Deficit Reduction The Sullivan Statistics Survey I...Ch. 9.1 - Random Walk Go to...Ch. 9.1 - Language The Sullivan Statistics Survey I asks, Is...Ch. 9.1 - NW High-Speed Internet Access A researcher wishes...Ch. 9.1 - Home Ownership An urban economist wishes to...Ch. 9.1 - A Penny for Your Thoughts A researcher for the...Ch. 9.1 - Credit-Card Debt A school administrator is...Ch. 9.1 - Football Fans A television sports commentator...Ch. 9.1 - Prob. 40AYUCh. 9.1 - Prob. 41AYUCh. 9.1 - Prob. 42AYUCh. 9.1 - Senate Race Gallup polled 982 likely voters...Ch. 9.1 - Cauliflower? Jane wants to estimate the proportion...Ch. 9.1 - Walk to Work Alan wants to estimate the proportion...Ch. 9.1 - Putting It Together: Hand Washing The American...Ch. 9.1 - Prob. 48AYUCh. 9.1 - Prob. 49AYUCh. 9.1 - Prob. 50AYUCh. 9.1 - Prob. 51AYUCh. 9.1 - Prob. 52AYUCh. 9.1 - Prob. 53AYUCh. 9.1 - The 114th Congress of the United States of America...Ch. 9.2 - As the number of degrees of freedom in the...Ch. 9.2 - True or False: The t-distribution is centered at .Ch. 9.2 - The notation t is the t-value such that the area...Ch. 9.2 - True or False: The value of t0.10 with 5 degrees...Ch. 9.2 - True or False: To construct a confidence interval...Ch. 9.2 - Prob. 6AYUCh. 9.2 - NW a. Find the t-value such that the area in the...Ch. 9.2 - a. Find the t-value such that the area in the...Ch. 9.2 - In Problems 912. a simple random sample of size n ...Ch. 9.2 - In Problems 912. a simple random sample of size n ...Ch. 9.2 - In Problems 912. a simple random sample of size n ...Ch. 9.2 - In Problems 912. a simple random sample of size n ...Ch. 9.2 - In Problems 1316, determine the point estimate of...Ch. 9.2 - In Problems 1316, determine the point estimate of...Ch. 9.2 - Prob. 15AYUCh. 9.2 - In Problems 1316, determine the point estimate of...Ch. 9.2 - A simple random sample of size n is drawn from a...Ch. 9.2 - A simple random sample of size n is drawn from a...Ch. 9.2 - Prob. 19AYUCh. 9.2 - A simple random sample of size n is drawn. The...Ch. 9.2 - You Explain It! Hours Worked In a survey conducted...Ch. 9.2 - You Explain It! Sleeping A 90% confidence interval...Ch. 9.2 - Prob. 23AYUCh. 9.2 - Prob. 24AYUCh. 9.2 - Hours Worked Revisited For the Hours Worked survey...Ch. 9.2 - Sleeping Revisited Refer to the Sleeping results...Ch. 9.2 - Blood Alcohol Concentration A random sample of 51...Ch. 9.2 - Hungry or Thirsty? How much time do Americans...Ch. 9.2 - Tootsie Pops A Tootsie Pop is a sucker with a...Ch. 9.2 - How Much Do You Read? A recent Gallup poll asked...Ch. 9.2 - NW pH of Rain The following data represent the pH...Ch. 9.2 - Travel Taxes Travelers pay taxes for flying, car...Ch. 9.2 - Crash Test Results The following data represent...Ch. 9.2 - Crawling Babies The following data represent the...Ch. 9.2 - Housing Starts The following data represent the...Ch. 9.2 - PepsiCo Stock Volume The trade volume of a stock...Ch. 9.2 - Tornadoes Go to...Ch. 9.2 - Tax Rate The Sullivan Statistics Survey II asks,...Ch. 9.2 - Prob. 39AYUCh. 9.2 - Prob. 40AYUCh. 9.2 - NW Sample Size Dr. Paul Oswiecmiski wants to...Ch. 9.2 - Sample Size Dr. Paul Oswiecmiski wants to estimate...Ch. 9.2 - Reading A recent Gallup poll asked Americans to...Ch. 9.2 - Television A researcher wanted to determine the...Ch. 9.2 - Prob. 45AYUCh. 9.2 - Effect of Outliers The following small data set...Ch. 9.2 - Putting It Together: Smoking Cessation Study...Ch. 9.2 - How Many Drinks? A question on the General Social...Ch. 9.2 - Prob. 51AYUCh. 9.2 - The procedure for constructing a t-interval is...Ch. 9.2 - Prob. 53AYUCh. 9.2 - Prob. 54AYUCh. 9.2 - Suppose you have two populations: Population AAll...Ch. 9.2 - Prob. 56AYUCh. 9.3 - For what type of variable does it make sense to...Ch. 9.3 - For what type of variable does it makes sense to...Ch. 9.3 - What requirements must be satisfied in order to...Ch. 9.3 - What requirements must be satisfied in order to...Ch. 9.3 - In Problems 512, construct the appropriate...Ch. 9.3 - Prob. 6AYUCh. 9.3 - Prob. 7AYUCh. 9.3 - Prob. 8AYUCh. 9.3 - Prob. 9AYUCh. 9.3 - Prob. 10AYUCh. 9.3 - Prob. 11AYUCh. 9.3 - Prob. 12AYUCh. 9.3 - Prob. 13AYUCh. 9.3 - Prob. 14AYUCh. 9.3 - Worried about Retirement? In a survey of 1008...Ch. 9.3 - Theme Park Spending In a random sample of 40...Ch. 9.3 - Fastball Clayton Kershaw of the Los Angeles...Ch. 9.3 - Prob. 18AYUCh. 9.3 - Sleep Apnea and Gum Disease Sleep apnea is a...Ch. 9.3 - Weight Gain Researchers conducted a study to see...Ch. 9.3 - Prob. 21AYUCh. 9.3 - Researchers at the Gallup Organization asked a...Ch. 9.3 - A researcher wanted to know whether consumption of...Ch. 9.3 - Prob. 24AYUCh. 9 - Find the critical t-value for constructing a...Ch. 9 - IQ Scores Many of the examples and exercises in...Ch. 9 - Prob. 3RECh. 9 - Prob. 4RECh. 9 - The area under the t-distribution with 18 degrees...Ch. 9 - Which is larger, the area under the t-distribution...Ch. 9 - Prob. 7RECh. 9 - A simple random sample of size n is drawn from a...Ch. 9 - A simple random sample of size n is drawn from a...Ch. 9 - Long Life? In a survey of 35 adult Americans, it...Ch. 9 - Prob. 11RECh. 9 - Prob. 12RECh. 9 - Prob. 13RECh. 9 - Prob. 14RECh. 9 - Hypertension In a random sample of 678 adult males...Ch. 9 - Prob. 1CTCh. 9 - Prob. 2CTCh. 9 - A question on the General Social Survey was this:...Ch. 9 - Prob. 4CTCh. 9 - The campus at Joliet Junior College has a lake. A...Ch. 9 - From a random sample of 1201 Americans, it was...Ch. 9 - Wimbledon Match Lengths A tennis enthusiast wants...
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