. The city of Edmonton, Canada recently completed an audit of abandoned bank accounts. An account is considered abandoned if it has not been accessed in the last 20 years. A random sample of 50 such accounts was collected and a 95% confidence interval for the true mean abandoned account balance was found to be (267.43, 1455.00) dollars. Which of the following statements is a correct interpretation of the 95 percent confidence level? (A) If many such samples of size 50 were taken, we would expect 95% of the intervals constructed to contain the mean balance of all abandoned bank accounts in Edmonton. (B) There is a 95% chance that the constructed confidence interval contains the mean balance of all abandoned bank accounts in Edmonton. (C) If another random sample of 50 abandoned bank accounts were taken, we would be 95% confident that the sample mean balance would fall between $267.43 and $1455.00. (D) If many such samples of 50 abandoned bank accounts were taken, we would expect 95% of the intervals constructed to contain the sample mean balance. (E) There is a 95% chance that the sample mean balance of these 50 abandoned bank accounts in Edmonton lies between $267.43 and $1455.00.

An issue of Time Style and Design reported on a poll conducted by Schulman Ronca &Bucuvalas Public Affairs about the shopping habits of wealthy Americans.A total of 603 interviews were conducted among a national sample of adults with householdincomes of at least $150,000. Of the adults interviewed, 410 said they had purchased clothing,accessories, or books online in the past year.a. Find a 95% confidence interval for the proportion of all U.S. adults with householdincomes of at least $150,000 who purchased clothing, accessories, or books online inthe past year.b. Interpret the confidence interval.

8. A survey of the mean number of cents off that coupons give was conducted by randomly surveying one coupon per page from the coupon sections of a recent San Jose Mercury News. The following data were collected: 15; 80; 50; 65; 30; 55; 40; 40; 30; 55; $1.50; 40; 65; 40. Assume the underlying distribution is approximately normal.

In a survey of 3242 adults aged 57 through 85​ years, it was found that 82.9​% of them used at least one prescription medication. Complete parts​ (a) through​ (c) below.   a. How many of the 3242 subjects used at least one prescription​ medication? ____ ​(Round to the nearest integer as​ needed.)   b. Construct a​ 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication. ____%<p<____% ​(Round to one decimal place as​ needed.)   c. What do the results tell us about the proportion of college students who use at least one prescription​ medication?   A. The results tell us that there is a​ 90% probability that the true proportion of college students who use at least one prescription medication is in the interval found in part​ (b). B. The results tell us​ that, with​ 90% confidence, the probability that a college student uses at least one prescription medication is in the interval found in part​ (b).…

A 95% confidence interval for how much time on average GRC students spend doing homework every day is 75 to 105 minutes.Choose a correct interpretation of the statement above. A. If random sampling is repeated, 95% of the confidence intervals created will capture the true mean. B. If random sampling is repeated, 95% of the samples will have a mean that is between 75 and 105 minutes. C. 95% of GRC students study between 75 and 105 minutes on average every day. D. There is 95% chance that the true mean is between 75 and 105 minutes.

what is the effect of selecting a higher confidence level (e.g., 99% vs. 68%) on:1.  The associated Z score:A. Increases B. Decreases C. Stays the same 2. The observed sample average:A. Increases B. Decreases C. Stays the same 3. The range of values the population average might take:A. Increases B. Decreases C. Stays the same

5. In a random sample of five airlines, the round trip fare from Ontario to San Francisco is found to be $266, $288, $297, $316, and $384. Assume that airfares are normally distributed with a standard deviation of $45 dollars. a. find the sample mean. b. construct a 90% confidence interval for the population mean. c. construct a 95% confidence interval for the population mean. N(0,1)