Answer:
98% Confidence interval: (26.939,42.461)
Step-by-step explanation:
We are given the following in the question:
Sample mean,
= 34.7 bushels per acre
Sample size, n = 9
Alpha, α = 0.05
Sample standard deviation, s = 8.04 bushels per acre
Degree of freedom = n - 1 = 8
98% Confidence interval:
Putting the values, we get,
is the required confidence interval for the true mean yield.
Answer: z= -2.35
Step-by-step explanation:
When the population variation is know, then we calculate the z-statistic.
Formula to calculate the z-test statistic is given by :-

where , n= sample size
= sample mean
= Population mean
=Population standard deviation.
As per given we have,
n= 270



Then, z-statistic will be
(Substitute all the values )
Hence, the value of the test statistic= z= -2.35
Answer: 46
Step-by-step explanation: devil in a new dress by kanye west will help you