Struggling with Statistics?
Join thousands of students who trust us to help them ace their exams!Watch the first videoFor which of the following scenarios can you NOT create a confidence interval using the standard normal or t-distribution?
In an attempt to see how their electric bill compares to their neighbors, a couple talks with 5 others on their street. They find that the sample mean monthly electric bill is $99.50 with a sample standard deviation of $9.20. Construct a 99% confidence interval for the population mean monthly electric bill.
Of 29 randomly selected rugby players, the sample mean resting heart rate is found to be 54 bpm with a population standard deviation of 3 bpm. Assuming the heart rates are normally distributed, construct an 80% confidence interval for the population mean resting heart rate.
400 random gas stations are found to have a sample mean cost of $3.50 per gallon with a sample standard deviation of $0.50. Construct a 95% confidence interval for the true mean spending on books.
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