please answer first one and then a-d on second one!! thank you!
Posted: Wed May 11, 2022 4:38 pm
please answer first one and then a-d on second one!! thank you!
The average daily volume of a computer stock in 2011 was u = 35.1 million shares, according to a reliable source. A stock analyst believes that the stock volume in 2018 is different from the 2011 level. Based on a random sample of 40 trading days in 2018, he finds the sample mean to be 32.6 million shares, with a standard deviation of s = 13.7 million shares. Tost the hypotheses by constructing a 95% confidence interval Complete parts (a) through (c) below. a (a) State the hypotheses for the test. = 35.1 million shares Ho: н: р # 35.1 million shares (b) Construct a 95% confidence interval about the sample mean of stocks traded in 2018. With 95% confidence, the mean stock volume in 2018 is between million shares and (Round to three decimal places as needed.) million shares
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 110, and the sample standard deviation, s, is found to be 10. (a) Construct an 80% confidence interval about if the sample size, n, is 21. (b) Construct an 80% confidence interval about if the sample size, n, is 16. (c) Construct a 70% confidence interval about if the sample size, n, is 21. (d) Could we have computed the confidence intervals in parts (a)-(c) if the population had not been normally distributed? Click the icon to view the table of areas under the t-distribution. (a) Construct an 80% confidence interval about if the sample size, n, is 21. Lower bound: :Upper bound: (Use ascending order. Round to one decimal place as needed.)
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A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 110, and the sample standard deviation, s, is found to be 10. (a) Construct an 80% confidence interval about if the sample size, n, is 21. (b) Construct an 80% confidence interval about if the sample size, n, is 16. (c) Construct a 70% confidence interval about if the sample size, n, is 21. (d) Could we have computed the confidence intervals in parts (a)-(c) if the population had not been normally distributed? Click the icon to view the table of areas under the t-distribution. (a) Construct an 80% confidence interval about if the sample size, n, is 21. Lower bound: :Upper bound: (Use ascending order. Round to one decimal place as needed.)