A city council is trying to determine if library B, with extended hours, has a higher proportion of patrons under the age of 18 than library A, which closes at 6:00 pm. A random sample of patrons from both libraries are checked. The results of the data collected are shown below. Library A Successes Observations Proportion Confidence level Z-score p-value Library B 56 Successes 150 Observations 0.373 Proportion 95% 2.091 0.0183 97 200 0.485 Library A patrons: nA = Library B patrons: nB = Sample proportion for library A patrons: PA Ex: 9 A -3 -2 -1 0 - Ex: 1.234 Sample proportion for library B patrons: B = p=Ex: 1.234 1 2 3 z = Ex: 1.234

A learn-to-type software program claims that it can improve your typing skills. To test the claim and possibly help yourself out, you and six of your friends decide to try the program and see what happens. Use the table below to construct an 80% confidence interval for the true mean change in the typing speeds for people who have completed the typing program. Let Population 1 be the typing speed before taking the program and Population 2 be the typing speed after taking the program. Round the endpoints of the interval to one decimal place, if necessary. Typing Speeds (in Words per Minute) Before After 32 33 51 42 55 40 35 32 54 33 45 30 50 52

Create an Excel spreadsheet. Conduct an independent sample t-test evaluating if cat owners or dog owners love their pet more. Ratings for cat owners- 7,6,5,9,5 Ratings for dog owners- 8,7,9,10 Write APA formatted results for thus analysis, including Cohen's d for the results and a bar graph with Error Bars showing 95 percent confidence intervals.

An online retailer has identified the maximum willingness of 10 consumers to pay for the same product. The 10 prices are: $10.00, $11.50, $9.50, $10.20, $11.20, $10.50, $9.80, $10.10, $9.90, $11.00 The retailer seeks a 95% confidence interval for the mean price consumers are willing to pay. The sample mean is calculated as $10.37, and the sample standard deviation is $0.66. Also consider the following t-values: Degrees of freedom 8 a. (9.99, 10.75) 9 10 90% confidence 1.86 1.833 1.812 95% confidence 2.306 2.262 2.228 99% confidence 3.355 3.250 3.169 Selecting the correct t-value, calculate the limits of the confidence interval.

A researcher investigates whether single people who own pets are generally happier than singlepeople without pets. A group of non-pet owners is compared to pet owners using a mood inventory.The pet owners are matched one to one with the non-pet owners for income, number of closefriendships, and general health. A. Single-sample z-testB. Single-sample t-testC. Independent samples t-testD. Related samples t-test (repeated measures or matched samples)E. Correlation

Twenty-two car salespeople were sampled to see how many cars they sold in a month; the following data was obtained: 26, 20, 22, 18, 21, 14, 24, 28, 17, 23, 28, 29, 18, 17, 24, 26, 19, 27, 26, 22, 23, 25 Construct a 95% confidence interval for the mean number of cars sold per month by the population of car salespeople. S = t = Margine of Error: E = We are 95% confident that, on average, car salespeople sell between cars and cars per month.

Use the sample data and confidence level given below to complete parts​ (a) through​ (d).   A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll, n=1005 and x=534 who said​ "yes." Use a 99% confidence level.   LOADING... Click the icon to view a table of z scores.       Question content area bottom Part 1 ​a) Find the best point estimate of the population proportion p.   enter your response here ​(Round to three decimal places as​ needed.) Part 2 ​b) Identify the value of the margin of error E.   E=enter your response here ​(Round to three decimal places as​ needed.) Part 3 ​c) Construct the confidence interval.   enter your response here<p<enter your response here ​(Round to three decimal places as​ needed.) Part 4 ​d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below.     A. One has 99​% confidence that the interval from the lower bound to the upper bound…

A researcher believe that increasing attention given to children will improve academic performance. He invites parents to volunteer during school to help the children with their activities. At the end of the school year he compares the academic performance of these children with the mean and standard deviation of historical rate on academic achievement. Which statistic test is appropriate for this study and why? (By using the decision tree). A. Z test B. Single sample t test C. Two independent samples t test D. Two related samples t test E. One way between subjects ANOVA F. Correlation