Using the t-distribution, the most appropriate conclusion for the hypotesis test is given by Phone use did not change.
<h3>How to find the value of z-statistic for population mean? (z test statistic)</h3>
Suppose we're specified that:
The sample mean =
The population mean =
The population standard deviation =
The sample size = n
Then the z-statistic for this data is found as:
In this problem, the values of those parameters are as follows:
The sample mean = -0.2
The population mean = = 0
The population standard deviation = = 9.1
The sample size = n = 200
Hence, the test statistic is given by:
Thus,
t = 0.31.
Since the absolute value of the test statistic is less than the critical value, we do not reject the null hypothesis and the conclusion is:
Phone use did not change.
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Answer: its 5
Step-by-step explanation: 2 plus 2 plus 1 eqael 5 hehehehe
Answer:
V=680
Step-by-step explanation:
Answer:
q = 27
Step-by-step explanation:
Answer:
1 9/16
Step-by-step explanation:
First, you do 25 - 16, and the answer is 9. After that you put a 1, as its a whole. Lastly, you put the 9 on top of the 16.