A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears bell-shaped with a mean of $9000and a standard deviation of $3500. Construct a 98% confidence interval for the mean of all such costs.Moreover,interpret the confidence interval.
A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty...
A study was conducted to compare the proportion of drivers in Boston and New York who wore seat belts while driving. Data were collected, and the proportion wearing seat belts in Boston was 0.581 and the proportion wearing seat belts in New York was 0.832. Due to local laws at the time the study was conducted, it was suspected that a smaller proportion of drivers wear seat belts in Boston than New York. (a) Find the test statistic for this...
****I would like to know how this was done long hand, please. 14. Seat Belts A study of seat belt use involved children who were hospitalized after motor vehicle crashes. For a group of 123 children who were wearing seat belts, the number of days in intensive care units (ICU) has a mean of 0.83 and a standard deviation of 1.77. For a group of 290 children who were not wearing seat belts, the number of days spent in ICUs...
a study is conducted to test the hypothesis that people with glaucoma have higher than average blood pressure. the study includes 30 people with glaucoma whose mean bp is 140 mm hg with a standard deviation of 24mm hg. the distribution of sbp appears to be bell shaped. you need to construct a 95% confidence interval for the true mean sbp among people with glaucoma. to help you do so, answer each of the following questions. What is the standard...
3. large-scale currently h medi study was conducted to estimate the difference in the proportion of male and female adults who ave medical coverage. A sample of 1,200 randomly selected adult males found that 852 currently had cal coverage. An independent sample of 1,400 randomly selected adult females found that 938 currently had coverage. If we let pı represent the proportion of all adult males who currently have medical coverage p> the proportion of all adult females who currently have...
Researchers conducted a study to determine an initial estimate for the effectiveness of the influenza vaccine during the 2014-2015 influenza season (Flannery et al., 2015). The participants in the study were randomly selected from 2321 individuals with respiratory illness from five U.S. states. In Pennsylvania, the study found that, out of 461 patients with acute respiratory illness, 210 had received the influenza vaccine. which procedure should be used for calculating a 95% confidence interval for the vaccinated patients in Pennsylvania,...
In a study conducted in March 2020, 144 of 200 randomly selected students said that Liverpool football team were their favourite team. (a) Construct a 98% confidence interval to estimate the true proportion of students who said that Liverpool football team were their favourite team. (b) How large a sample would be necessary to estimate the true proportion of with a margin of error of 5%, with 95% confidence?
Twenty-four technicians in a computer repair shop are randomly selected to participate in a study comparing two motherboard repair techniques. They are randomly assigned one of the two techniques. The manager trains 12 technicians on one technique and trains the other 12 technicians on the second technique. He then records the number of motherboard repairs each technician does in one week. Which inferential statistical test would be most appropriate for this scenario? a) The entire population is measured in both...
in a time use study, 20 randomly selected managers were found to spend a mean if 2.25 hours each day on paperwork. the standard deviation of the 20 scores is s =1.7 hours. construct he 98% confidence Interval for the population standard deviation. use x2- distribution for analysis.
QUESTION 21 If we change a 90% confidence interval estimate to a 99% confidence interval estimate while holding sample size constant, we can expect a. the width of the confidence interval to increase. b. the width of the confidence interval to decrease. c. the width of the confidence interval to remain the same. d. the sample size to increase. QUESTION 22 Which one of the following is a correct statement about the probability distribution of a t random variable? a....
A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for randomly selected subjects are given in the following table. Use a-0.05 Subjects | A | B | C | D | E | F | G Before6.6 6.5 9.0 10.3 11.3 8.1 6.3 11.6 After 6.8 2.4 7.48.5 8.1 6.1 3.42.0 a) Identify the hypotheses, (Ho and H b) Find the margin of error c) Construct a 95% confidence interval estimate of the mean "before-after"...