QUESTION 7The results of an empirical study reveal the following:n=27, sample mean = 3,000, sample standard deviation = 900. The 90% confidence interval of the true population mean is closet to:%3D2,400 and 3,4001,200 and 4,8002,700 and 3,3002,000 and 4,000QUESTION 8An analyst studied the average savings of recent college graduates. The results of the study reveal the following:n=40, sample mean =$16,000, sample standard deviation = $5,000.The probability that a randomly selected recent graduate has savings of $18,000 or more is closet toHint: You need to calculate a z-score and remember to use the standard error in your calculationsmore than 5%less than 1%about 95%about 68%

Given n=27 Sample mean, x¯=3000 Sample standard deviation, s=900 Confidence interval=90%

Answered: QUESTION 7 The results of an empirical…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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QUESTION 28 The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and are participating in a study of risk factors for obesity. Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI. 25 27 31 33 26 28 38 41 24 32 35 40
QUESTION 3 A hardware store determined the current balances for a random sample of 100 customers with non-zero balances. The sample mean of the amount owed was $100.00 and the standard deviation was $25. Use the assumption that the sample standard deviation is equal to the population standard deviation. How many customers should be included in the sample if the desired 95% confidence interval has a desired error margin E of $2.00?
Question 8: A 1991 survey of 1984 graduates of different colleges in the East of the U.S., respondents were asked their 1990 income. Sub-samples of 1,017 employed graduates of liberal arts colleges and 374 employed graduates of large state universities have the following means and standard deviations for 1990 income (in thousands of dollars): Mean Std. Dev. n Liberal arts 33.879 25.369 1,017 college Large state university 28.630 22.750 374 Test the (alternative) hypothesis that graduates of liberal arts colleges earn more than graduates of large state universities against the null hypothesis of no difference in their earnings. (Use a 5% level of significance. Do not assume that the variance of earnings of liberal arts college graduates is equal to the variance of earnings of graduates from large state universities). Show all four steps.
QUESTION 16 In 2005, Health Canada claimed that 16.6% of Canadian adults are obese. A researcher wanted to check whether this percentage has increased in 2009. He randomly selected 160 Canadian adults and found 30 of them are obese. He wants to develop a 92% confidence interval for the obese percentage in 2009. Write down the critical value
QUESTION 9 A random sample of 500 ZU students are surveyed to determine if they own a tablet. It was found that a 95% confidence interval of the true population proportion of ZU students who own tablets is (0.406, 0.494). Find the point estimator of the true population proportion of ZU students who own tablets. Round your answer to two decimal places.
QUESTION 1 A hardware store determined the current balances for a random sample of 100 customers with non-zero balances. The sample mean of the amount owed was $100.00 and the standard deviation was $25. Use the assumption that the sample standard deviation is equal to the population standard deviation. You are asked to find a confidence interval for the average amount owed by all customers with a non-zero balance. Which Minitab procedure would be most appropriate to use for this task? O Power and Sample Size/1-Sample Z O Power and Sample Size/Sample Size for Estimation/1-Sample Z O Basic Statistics/1-Sample Z O Basic Statistics/1-Sample t
Imagine that a study of memory and aging finds that younger participants correctly recall 55% of studied words, older participants correctly recall 42% of studied words, and the size of this effect is Cohen's d = 0.49. This effect size indicates that the memory performance of: Question 10 options: younger participants is approximately half a standard deviation below that of older participants. older participants is approximately half a standard deviation below that of younger participants. younger participants is significantly lower than that of older participants. older participants is approximately 4 standard deviations below that of younger participants.
QUESTION 17 Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. A researcher was interested in comparing the resting pulse rates of people who exercise regularly and the pulse rates of people who do not exercise regularly. She obtained independent simple random samples of 16 people who do not exercise regularly and 12 people who do exercise regularly. The resting pulse rates (in beats per minute) were recorded and the summary statistics are as follows. Do not exercise regularly Exercise regularly x1 = 723 beats/min x2 = 68.1 beats/min %3D s1 = 10.9 beats/min s2 = 8.2 beats/min ni = 16 n2 = 12 Construct a 95% confidence interval for mu1 - mu2, the difference between the mean pulse rate of people who do not exercise regularly and the mean pulse rate of people who…
Question 2 Part B
Question 30: give the test statistic
question 3
Question 15: you are considering taking two professors for a statistics course. both professors have an average of 65%. The first professor has a Standard deviation of 1%. The second professor has a standard deviation of 15%. Which professor do you have a better chance of passing with?

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