Suppose that in Problem 1 only 25 of 36 randomly selected family caregivers responded, so we have the following data: 55 53 47 47 49 43 47 40 48 41 44 51 48 43 50 49 47 42 42 47 47 49 46 46 43 Assuming that these data come from a population that has a normal distribution, (a) Determine a 99% confidence interval for the mean ages of all US caregivers. (b) Determine a one-sided lower and one-sided upper 99% confidence interval for the mean ages of all US caregivers.

Suppose a 95% confidence interval for the difference in test scores between Class 1 and Class 2 (in that order) is the following: 9 +/− 2. These results were based on independent samples of size 100 from each class. Now suppose you switch the order of Class 1 and Class 2 in your analysis but keep the data labeled correctly in terms of which class they came from. Which of the following statements is false? A) You can't do it this way. You'll get negative numbers for the difference in the means and/or negative numbers for the standard error. B) You are confident that the average for Class 2 is 7 to 11 points lower than for Class 1.    C) You are still confident that the classes have significantly different mean scores. D) Your 95% confidence interval will now be entirely negative: from −7 to −11.

Question 82 parts A, B, and C

Question 2 The Warren County Telephone Company claims in its annual report that “the typical customer spends $60 per month on local and long distance service”. A sample of 12 subscribers revealed the following amounts spent last month. $64 $66 $64 $66 $59 $62 $67 $61 $64 $58 $54 $66 a. What is the point estimate of the population mean? b. Develop a 90% confidence interval for the population mean. c. Is the company’s claim that the “typical customer” spends $60 per month reasonable? Justify your answer. Note: 1.please clear answer no whois one (a),(b) & (c) 2. No need excel formula!

4.A college student is interested in whether there is a difference between male and female students in the amount of time they spend studying each week period the student gathers information from a random sample of male and female students on campus. The amount of time spent studying is normally distributed. The data are: Male      Female 27          25 25           29           19           18 10           23           16           20 22           15 14           19   What statistical test should be done to analyze these data? Identify Ho and Ha for this study. Conduct the appropriate analysis. Should Ho be rejected? What should the researcher conclude? If significant, compute and interpret the effect size.

1. An educational psychologist at a large university wants to estimate the mean IQ of the students in tertiary institutes in UK. A random sample of 15 students (in universities in UK) gives the following data on IQs. From further investigation, the data are normally distributed. 113 120 103 118 104 98 110 126 88 110 126 112 120 101 115   a. At the 5% significance level, do the data provide sufficient evidence to conclude that the IQ of tertiary students in UK is higher than the common UK adults? b. Obtain the 95% confidence interval for the mean IQ of tertiary students in UK.(Given that IQs of UK adults are normally distributed with µ = 100 and  = 16.)  2. In US, the mean weekly earning of male works was $1005 last year. A random sample of 50 female workers, their weekly earnings also last year in dollars are provided in the following table. 560 360 688 1301 49 582 751 4131 3211 646 1312 1931 764 297 232 699…