Question 1
Solve the problem. Round your answer to the nearest whole number unless indicated otherwise.
A sample of 400 employees from a particular software company had a mean monthly income of
with a standard deviation of
. Find the 95% confidence interval. Round your answer to the nearest dollar.
◦ $7012 < μ < $7564
◦ $7274 < μ < $7302
◦ $6984 < μ < $7592
◦ $7150 < μ < $7426
Question 2
Solve the problem. Round your answer to one decimal place, if necessary.
A random sample of 30 seventh grade students was selected from a particular school district. The students were asked how many siblings they had. The responses are given below. Find a 95% confidence interval for the mean number of siblings for the population of seventh grade students in this school district.
◦ 1 sibling < μ < 2.5 siblings
◦ 1.3 siblings < μ < 2.5 siblings
◦ 1.4 siblings < μ < 2.1 siblings
◦ 1.1 siblings < μ < 2.3 siblings
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Problem