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.
Answer: Absolute value
Step-by-step explanation: Absolute value means <em>distance from zero</em> on a number line. We represent the absolute value of a number by using a vertical bar on either side of the number. Absolute value will always be positive except for 1 special case which I provided in the image attached.
Move the Decimal place 4 times right from the five
Answer:
Step-by-step explanation:
time taken to complete the second half=65.49-31.73=33.76 seconds
Answer:
negative times A negative is a positive so your answer is 27
Step-by-step explanation: