cording to a report in USAToday, more and more parents are helping ndom sample of 40 young adults who recently purchased a home in K onstruct a 95% confidence interval for the population proportion of all y s the margin of error for a 95% confidence interval for the population pr Multiple Choice

The National Honor Society at Central High School plans to sample a random group of 100 seniors from all high schools in the state in which Central High School is located to determine the average number of hours per week spent on homework. A 95 percent confidence interval for the mean number of hours spent on homework will then be constructed using the sample data. Before selecting the sample, the National Honor Society decides that it wants to decrease the margin of error. Which of the following is the best way to decrease the margin of error? (A) Increase the confidence level to 99% (B) Use the population standard deviation (C) Use the sample standard deviation (E) Decrease the sample size (D) Increase the sample size

Tutoring Question Help The following data represent the length of time, in days, to recovery for patients randomly treated with one of two medications to clear up severe bladder infections, Find a 95% confidence interval for the difference u,-H, between in the mean recovery times for the two medications, assuming normal populations with equal variances. Medication 1 = 13 si=17 s3 =13 X1 = 14 Medication 2 n2 = 17 X2 = 18 The confidence interval is <2-H1< (Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer All parts showing Clear All Faral Cherk US 8:37

Answer A, B, C or D Then.. determine the test statistic  determine the P-value state the conclusion for the test Construct a confidence interval suitable for testing the claim that the two samples are from populations with the same mean: ____ < u1 - u2 < _____

Reporting a cheat  What proportion of students are willing to report cheating by other students? A student project put this question to an SRS of 172 undergraduates at a large university: " You witness two students cheating on a quiz. Do you go to the professor?" Only 19 answered "Yes." Show that the conditions for calculating a confidence interval for a proportion are satisfied. Calculate a 99% confidence interval for the proportion of all undergraduate students at this university who would answer "Yes." Interpret the interval from Question #2

A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a 95% confidence interval for the mean of the "before-after" differences. Does hypnotism appear to be effective in reducing pain? Before After 8.3 6.7 5.8 2.6 9.9 7.8 Get more help. 6.8 8.6 possible 9.8 8.6 7.8 Construct a 95% confidence interval for the mean of the "before-after" differences. << (Round to two decimal places as needed.) Does hypnotism appear to be effective in seducing pain? 6.7 68°F 5.4 3.7 6.9 OA. No, because the confidence interval includes zero. B. Yes, because the confidence interval includes zero. OC. Yes, because the confidence interval does not include zero and is entirely greater than zero. 2.1 Ne 125 7/2

use pic to answer, test is anova one way test 1. Did researchers use the correct test? a. yes b. no 2. Justify your answer, above. a. ANOVa can be used when you have three or more levels of an independent variable b. regression analysis would be prefereable because the independent variable is contiuous c. anovas primary strength is its ability to examine for difference in two groups d. you can use anove wiht three levels, but a t-test would be easier and give you the same results 3. How would you interpret the results of this oneway ANOVA? a. there is likely a difference in happiness in the "population" b. there is no mean differences in happiness across the three conditions c. there are mean differences but we do now know which conditions differ d. those who spend time reminiscing are signficantly more likely to be happy than those who dont

Here is a sample  amount of weight  change  in kg of college  students in their  freshman year  10, 8, 5, -8, were -8 represents loss of 8 kg and positive  values represent  weight  gained.  Using the 200 bootstrap samples  complete  part a) and part b) a) construct a 90% confidence  interval of the mean weight  change  for the population  using the 200 bootstrap  samples  kg < p< kg B) construct  a 90% confidence interval  estimate  of standa deviation  of the weight  changes for the population  using the 200 bootstrap  samples. Kg< s< kg