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15 marks) 1. Complete this question by hand and making use of appropriate tables, round results...
This Question: 1 pt 5 of 15 (3 complete) This Test: 15 pts possit Question Help In a random sample of 18 people, the mean commute time to work was 34.7 minutes and the standard deviation was 73 minutes. Assume the population is normally distributed and use a t-distribution to construct a 95% confidence interval for the population mean . What is the margin of error of Interpret the results The confidence interval for the population mean is ( (Round...
DO NOT RESPOND IF YOU DO NOT KNOW HOW TO FULLY COMPLETE THE QUESTION! THIS IS MY SECOND TIME POSTING THIS QUESTION. A research analyst is examining a stock for possible inclusion in his client's portfolio. Over a 15-year period, the sample mean and the sample standard deviation of annual returns on the stock were 15% and 14%, respectively. The client wants to know if the risk, as measured by the standard deviation, differs from 12%. (You may find it...
Please computer typed, do not use hand writing! ! ! Thanks Question 3 (4 marks) Part a) Given the following information X-500, σ=12, n=50 i) Determine the 95% confidence interval estimate of population mean. ii) Determine the 99% o confidence interval estimate of population mean Part b) A statistics practitioner calculated the mean and standard deviation from a sample of 51. They are X-120 and s-15. (i) Estimate the population mean with 95% confidence level (ii) Estimate the population mean...
E is yes or no option!!! Thank you Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 10 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: Hours 3 2.6 2.4 2.8 2.4 2 2 2.4 2.2 2.9 a) What is a point estimate for the population mean length of time. (Round answer to 4 decimal places) b)What must...
You may need to use the appropriate appendix table or technology to answer this question. CCN and ActMedia provided a television channel targeted to individuals waiting in supermarket checkout lines. The channel showed news, short features, and advertisements. The length of the program was based on the assumption that the population mean time a shopper stands in a supermarket checkout line is 8 minutes. A sample of actual waiting times will be used to test this assumption and determine whether...
Suppose you are a researcher in a hospital. You are experimenting with a new tranquilizer. You collect data from a random sample of 10 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: 2.4 2.2 2.2 2.6 2.2 2 2.5 2.8 2 2.4 What is a point estimate for the population mean length of time. (Round answer to 4 decimal places) Which distribution should you use for this problem? normal distribution t-distribution What...
1. Recall that a bank manager has developed a new system to reduce the time customers spend waiting to be served by tellers during peak business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes. The bank manager hopes that the new system will have a mean waiting time that is less than six minutes. The mean of the sample of 100 bank customer waiting times in Table 1.9 is...
Can someone help me with these problems? Thank you. 1. True or False. (a) Confidence intervals are a useful alternative to gathering data from an entire population. (b) As the level of confidence increases, the width of the confidence interval should decrease. (c) As the sample size increases, the width of the confidence interval should decrease. (d) Rejecting the null hypothesis means that you should reject the claim. (e) Injecting bleach is an effective way to treat Covid-19. 2. You...
Is this possible? yes or no Is it likely? yes or no Suppose you are a researcher in a hospital. You are experimenting with a new random sample of 13 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: tranquilizer. You collect data from a Hours 2.2 2.7 2.1 2.6 2.6 2.3 2.4 2 2.4 2.1 2.9 2.2 2.5 a) What is a point estimate for the population mean length of time. (Round...
Question 1 (15 marks) According to Nielsen Media Research, the average number of hours of TV viewing per household per week in the United States is 50.4 hours. (a) Suppose the population standard deviation is 11.8 hours and a random sample of 42 U.S. household is taken, what is the probability that the sample mean TV viewing time is between 47.5 and 52 hours? (b) Suppose the population mean and sample size is still 50.4 hours and 42, respectively, but...