Question
A study was conducted to determine the mean cost to repair a mobile device. Assume that the population is normally distributed. A sample of 12
A study was conducted to determine the mean cost to repair a mobile device. Assume that the population is normally distributed. A sample of 12 devices was randomly selected. The sample mean was $90.42 and the sample standard deviation was $33.61.
a. What is the point estimate of population mean?
b. To construct 95% confidence interval for population mean, find the degree of freedom.
c. To construct 95% confidence interval for population mean, find the critical value.
d. To construct 95% confidence interval for population mean, calculate the margin of error.
e. Construct 95% confidence interval for population mean.
f. Interpret the confidence interval in part e.
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