Question

A car dealership announces that the mean time for an oil change is less than 15 minutes. For the given scenario, the H0 15 and Ha < 15.

A population is the collection of all outcomes, responses, measurements, or counts that are of interest.
A recent survey of 200 college career centers reported that the average starting salary for petroleum engineering majors is $83,121. The average salary provided here is the population parameter.
For a given sample size of 40, 95% confidence level, and sample standard deviation of about 53, the margin of error will be 16.4.
Outlier is a measure of the typical amount an entry deviates from the mean.
A data set can have the same mean, median, and mode.

Answer 1

Corrected statement:

A car dealership claims that the mean time for an oil change is less than 15 minutes, with a null hypothesis (H0) of 15 and an alternative hypothesis (Ha) of less than 15.

A population refers to the entire set of individuals, objects, or measurements that we are interested in studying.

A recent survey of 200 college career centers found that the average starting salary for petroleum engineering majors is $83,121, which serves as an estimate for the population parameter.

For a given sample size of 40, a 95% confidence level, and a sample standard deviation of approximately 53, the margin of error is calculated to be 16.4.

An outlier is an observation that falls significantly outside of the expected range of values in a dataset.

It is possible for a dataset to have the same mean, median, and mode. This occurs when the data is symmetrically distributed.