You conducted a HT for two independent means based on samples of size 30 and 40. Your test statistic was 0.70. Then

For planning purposes you estimate that the mean operating costs for the company you work for in 2021 are $180,000 ± $20,000 with 95% confidence. Your supervisor is perplexed because she recalls you told her that the operating costs would be less than $185,000. You explain to her that:

You record the IQ scores of ten university students twice a year for four years and study their performance in relation to their gender and ethnicity. This is an example of:

The proportion of people in Canada with more than one citizenship is about 11%.

In a simple random sample of 100,000 Canadians, what is the expected number of people with only one citizenship?

The height of an adult man is normally distributed with mean 170 cm and sd 10 cm.

It is more likely to find a 25 men whose average height is less than 170cm vs finding 25 men whose average height is greater than 180cm.

Wait times to see a doctor in walk-in clinics follow a bell shape distribution with a mean of 40 minutes and a standard deviation of 10 minutes. In a sample of 100 patients, about how many would have to wait at least 50 minutes?

The height of an adult man is normally distributed with mean 170 cm and sd 10 cm.

It is more likely to find a 25 men whose average height is less than 160cm vs finding a man whose height is greater than 180cm.

The weight of women in a certain population is normally distributed with men 68 kg and standard deviation 7 kg. Complete the following:

If a randomly selected woman has a weight of 55, then her z-score is: