Suppose you take a random sample of n = 80 Douglas College students and ask each student their age. You find that the mean age of students in this sample is X with bar on top equals 22.0375 years and the sample standard deviation is s = 3.2014 years. Based on this study, what is the best point estimate of the population mean age, μ, of all Douglas College students? Enter your answer rounded to four decimal places. The 95% confidence interval for the mean age of all Douglas College students is from 21.3251 years to 22.7499 years. You can find this either by calculating the critical critical value or by using Excel’s CONFIDENCE.T function. In order to apply the procedure in Questions 11 and 12, certain conditions must be met. Which of the following are sufficient conditions and are also true (to the best of our knowledge) for this study of Douglas College students’ ages? Select all that apply. a. is a normal variable b. n>=30 c. nq>=5 d. np>=5
Suppose you take a random sample of n = 80 Douglas College students and ask each student their age. You find that the
The 95% confidence interval for the mean age of all Douglas College students is from 21.3251 years to 22.7499 years. You can find this either by calculating the critical critical value or by using Excel’s CONFIDENCE.T
In order to apply the procedure in Questions 11 and 12, certain conditions must be met. Which of the following are sufficient conditions and are also true (to the best of our knowledge) for this study of Douglas College students’ ages? Select all that apply.
| a. |
is a normal variable |
|
| b. |
n>=30 |
|
| c. |
nq>=5 |
|
| d. |
np>=5 |
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