A random sample of 875 subscription customers finds that 57 canceled within the first month. Construct a 98% confidence interval for the true population proportion of customers who cancel within the first month. Which interval is correct?

Using the following sample of drive-through service times, in seconds: 104, 118, 121, 135, 118, 142, 110, 126 Compute the median service time. Round to one decimal.

A student-services researcher compares the average number of weekly study hours for students enrolled in online sections versus in-person sections. Let μ₁ = mean weekly study hours for online-section students. Let μ₂ = mean weekly study hours for in-person-section students. The researcher claims that online-section students study at least as many hours on average as in-person-section students. Which setup correctly matches the claim, hypotheses, and tail direction?

A professor wants to know the average score on Exam 1 for her current statistics class of 38 students. She records the score of all 38 students in that class. What is this, relative to the population defined as her current class?

For independent events, the probability that all events occur is found by multiplying their individual probabilities.

A supervisor records the following five customer wait times: 50, 50, 55, 60, 65 Using sample formulas, what is the sample standard deviation?

When constructing a confidence interval for a population mean using a sample standard deviation, the margin of error becomes smaller if the sample size decreases, assuming the confidence level and sample standard deviation stay the same.

A quality-control department knows that 8% of parts are defective. Assuming independence, what is the probability that none of the next 4 parts inspected is defective? (round to 3 decimals)

A random sample of 36 customer service calls has a mean length of 14.8 minutes and a sample standard deviation of 4.2 minutes. A 95% confidence interval will be constructed for the population mean call length. What is the margin of error E? (round to 3 decimals)

Identify the correct order of measurement levels for the following variables: Product defect type: scratch, dent, missing part, wrong color Satisfaction rating: very dissatisfied, dissatisfied, neutral, satisfied, very satisfied Years of work experience IQ score