Assume that we want to construct a confidence interval. Do one of the following,
ID: 3369624 • Letter: A
Question
Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value ta/2. (b) find the critical value za/2, or (c) state that neither the normal distribution nor the t distribution applies. 40- 30- 20 10 The confidence level is 95%, ? is not known, and the histogram of 56 player salaries (in thousands of dollars) of football players on a team is as shown. 0 4000 8000 12000 16000 20000 Salary (thousands of dollars) Select the correct choice below and, if necessary, fill in the answer box to complete your choice (Round to two decimal places as needed.) Za/2 (Round to two decimal places as needed.) Neither the normal distribution nor the t distribution applies. ° C.Explanation / Answer
Since popualtion standard deviation is not know it is
T interval.
alpha=1-95%=1-0.95=0.05
alpha/2=0.05/2=0.025
df=n-1=56-1=55
t 0.025 for 55 df is
t=2.004
OPTION A
t alpha/2=2.00