Question 47 Part 3 To find the 90% confidence interval for the difference between the two populations, what tabulated va

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Question 47 Part 3 To Find The 90 Confidence Interval For The Difference Between The Two Populations What Tabulated Va 1 (183.41 KiB) Viewed 55 times

Question 47 Part 3 To find the 90% confidence interval for the difference between the two populations, what tabulated value should be used? Hint: Using equation 7.19a the degree of freedom (df) is 11 1645 Question 48 Question 49 Part 4 What is the estimated mean difference between the two populations? Hint: While calculating the difference between the two populations means, please use "First Year salary-Second Year salary" Question 50 0.5 pts Part 5 What is the standard deviation of the mean difference? Hint: When calculating the standard deviation of the mean difference, please assume that the variances of the two populations are unequal Question 51 Upper confidence limit -22.11 1 pts Part 6 What is the 90% confidence interval for the difference between the two population means? Lower confidence limit 347.89 Hint: Please use two decimal places for your answer Lower confidence limit Hint: Please use two decimal places for your answer 1 pts Upper confidence limit 1 pts Part 7 What is the 99% confidence interval for the difference between the two population means? 1 pts Section 8 A study was carried out to compare the salaries of first and second year forestry students during the summer of 1980. The random samples taken from the two populations are summarized below: X Question 45 Chi square distribution OF distribution distribution 02tution Question 46 1st Year Question 52 $1,125 Answer the following questions (Part 1 to Part 8) using this description. $300 10 Salary/Month Part 1 To find the 90% confidence interval for the difference between the two populations, what distribution should be used? 2nd Year $1,310 None of the above $130 Dianda Diandiv Didi 21 1 pts Part 2 To find the 99% confidence interval for the difference between the two populations. what tabulated value should be used? Hint: Using equation 7.19a the degree of freedom (df) is 11 0.5 pts Part 8 Based on your answers from Part 2 to Part 7 which of the following statements are correct or true? 1 pts i. There is sufficient evidence to conclude that 1st Year students made less on average than 2nd Year students at alpha-0.1 ii. There is not sufficient evidence to conclude that 1st Year students made less on average than 2nd Year students at alpha-01 ii. There is sufficient evidence to conclude that 1st Year students made less on average than 2nd Year students at alpha-0.01 iv. There is not sufficient evidence to conclude that 1st Year students made less on average than 2nd Year students at alpha -0.01