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An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary of all high school teachers.
A. (54837.9 , 58142.1)
B. (54637.9 , 60142.1)
C. (54607.2 , 58372.8)
D. (55398.7 , 57581.3 )
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval for the difference in the proportion of defectives.
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The null hypothesis is to be tested at the 10% level of significance. The critical value from the table is:
Is it reasonable to compute that the mean of the population is actually $15,000.
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To determine her blood pressure, Carolyn divides her day into three parts; morning, afternoon, and evening. She then measures her blood pressure at 4 randomly selected times during each part of the day. What type of sampling is used?
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