The final exam scores in a statistics class were as follows: 90, 70, 63, 98, 95, 32, 54, 89, 84, 80, 68, 71, 77, 71, 83 Find the
2 answers:
Answer:
75
Step-by-step explanation:
The mean [average] of a set of data is "the sum of all the numbers divided by the number of numbers".
<em>How many numbers are in the data set?</em>
<em>15</em>
<u>So we simply add all of them up and divide by sum by 15.</u> Doing so gives us the mean:
Mean =
The mean is 75
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Answer: We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.
Step-by-step explanation:
Given : Significance level :
Sample size : n= 52 , which is a large sample (n>30), so we use z-test.
By using z-value table,
Critical value:
Sample mean :
Standard deviation :
The confidence interval for population means is given by :-
i.e.
Now, the 95% confidence interval for the ppopulation mean = . (29.0813, 40.0187)
Hence, We are 95% confident that the mean SPF level of sunscreen used by all Cal Poly students is between 29.0813 and 40.0187.