In a survey of 3473 adults aged 57 through 85​ years, it was found that 84.6% of them used at least one prescription medication. Complete parts​ (a) through​ (c) below. a. How many of the 3473 subjects used at least one prescription​ medication? b. Construct a​ 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication. c. What do the results tell us about the proportion of college students who use at least one prescription​ medication?

24. Job Interviews In a Harris poll of 514 human resource professionals, 90% said that the appearance of a job applicant is most important for a good first impression. a. Among the 514 human resource professionals who were surveyed, how many of them said that the appearance of a job applicant is most important for a good first impression? b. Construct a 99% confidence interval estimate of the proportion of all human resource professionals believing that the appearance of a job applicant is most important for a good first impression. c. Repeat part (b) using a confidence level of 80%. d. Compare the confidence intervals from parts (b) and (c) and identify the interval that is wider. Why is it wider?

2. According to the website Rotten Tomatoes, 94% of people who watched the Netflix show Stranger Things liked it. Since UR students tend to be scientifically minded, we hypothesize that less than 94% of UR students like the show. Out of 219 surveyed UR students, 198 indicated they like Stranger Things. Use the built in prop.test() function to: a. Construct a 90% confidence interval for the proportion of UR students who like Stranger Things. b. Test at the a=0.10 significance level whether the proportion of students who like Stranger Things is LESS THAN 0.94. What conclusion do you reach?

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).…

Answer Part B

4.A prior study(by Pew Research 2021)found that 35 out of 50 randomly selected US adults between the ages of 18 to 29 use (or have used) Instagram. Construct a 99% confidence interval for the population proportion of US adults between the ages of 18 to 29 use (or have used) Instagram. (round to three decimal places)   a.Identify the following: X, N, P   b.Which distribution should you use for this problem?   c.What is the corresponding critical value for a 99% confidence interval?     d.Calculate the margin of error (3 decimal places)   e.Construct a 99% confidence interval f. Interpret the interval.

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

Ten engineering schools in the US were surveyed. the sample contains 250 electrical engineers, 80 being women; 175 chemical engineers, 40 being women. Compute a 90% confidence interval for the difference between the proportions of women in these two fields of engineering. Select one: O a. (0.02, 0.16) Ob. (0.01, 0.17] O. (0.04, 0.14) O d. [0.03, 0.15]

Listed below are the amounts of net worth​ (in millions of​ dollars) of the ten wealthiest celebrities in a country. Construct a 95​% confidence interval. What does the result tell us about the population of all​ celebrities? Do the data appear to be from a normally distributed population as​ required?   245 210 186 168 166 163 156 156 156 156

The following is the number of hours of sleep obtained by eight college freshmen.  Use the data to find a 92% confidence interval for the true mean number of hours of sleep by college freshmen. ​​7.5​    8.0​   6.5​  24​  8.5​  6.5​  7.0​   7.5