A random sample of 16 pharmacy customers showed the waiting times below (in minutes). 16 11 21 22 19 24 19 16 20 20 17 3 18 15 23 20 E Click here for the Excel Data File Find a 90 percent confidence interval for u, assuming that the sample is from a normal population.
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- Assume that the following samples are independent. In a random sample of 400 women, 47% favored health care reform. In a random sample of 300 men, 36% favored health care reform. Construct a 98% confidence interval for the difference between the population proportions p1 − p2 . Based on your interval, is there a significant difference between men and women’s opinions on health care reform? Explain. Calculator function:A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimete on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that th 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 4.8 6.3 2.4 2.6I only need part D answered. Thank you.A statistic center compiles data on the length of stay by patients in short-term hospitals. A random sample of 21 patients yielded the data on length of stay, in days, shown below. Complete parts (a) through (e) below. 25 2 5 9 3 21 55 23 23 7 23 5 6 17 25 5 23 13 17 23 a. Obtain and interpret the quartiles. Q1 Q2 Q3 %3D II II IIThe EPA tests cars for city miles per gallon (mpg). For one model, a sample of 16 cars were tested for mpg, the results follow. 28 25.7 25.8 28 28.5 29.8 30.2 30.4 26.9 28.3 29.8 27.2 26.7 27.7 29.5 28 Find the 95% confidence interval for mean mpg. Find the 99% confidence interval for mean mpg.Assume that samples have been randomly selected from normally distributed populations.The table below shows the weights of 9 subjects before and after following a particular diet for two months. Subject A B C D E F G H I Before 169 180 157 133 202 124 190 210 181 After 162 178 145 125 181 126 182 195 163 Construct a 99% confidence interval for the mean difference of the "before" minus "after" weights. Interpret the results.An Internet retailer would like to investigate the relationship between the amount of time in minutes a purchaser spends on its Web site and the amount of money he or she spends on an order. The table to the right shows the data from a random sample of 12 customers. Construct a 99% confidence interval for the regression slope. Construct a 99% confidence interval for the slope. LCL = and UCL = (Round to three decimal places as needed.) C Time 20 12 28 22 1 13 Order Size $71 $23 $93 $198 $54 $35 Time 5 37 8 37 25 8 Order Size $57 $360 $122 $161 $72 $248Please See ScreenshotA developmental psychologist believes that children’s self-esteem scores change with age. She measures N=8 children’s self-esteem in 3rd grade and again in 6th. Evaluate the results of her data using α = .052tail. **Attached Image** a. Show how the 95% confidence interval was calculated. b. State the conclusion in APA format. c. What is Cohen’s d?A certified mechanic was timed for the repair of an automobile on 14 separate occasions.Over the same period a trainee mechanic was timed for the repair of a similar automobile.The times in minutes are given belowCertified 344 276 257 334 267 164 222 343 212 175 211 311 209 188Trainee 222 342 178 234 398 232 377 211 309 190 351 343 177 269 a. Calculate a 99% confidence interval for the mean time taken to repair the automobileby the (i) certified mechanic and (ii) the trainee mechanic. b. Test the hypothesis that the two mean times for both mechanics are equal. Use the 5%level of significance. Subsequently, it was learnt that the times for the trainee were incorrecly recorded andthat each of the values above is 30 minutes too small. What, if any, difference doesthis make to the results of the test done in part (b)?Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? 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