Identify which procedure should be used in each of the following hypothetical ex

Question

Identify which procedure should be used in each of the following hypothetical examples.

Identify which procedure should be used in each of the following hypothetical examples A union representative wants to estimate how much time the union workers spend commuting to work each day. She surveys a simple random sample of 75 union workers and asks them how many minutes they spend commuting to and from work on an average day. She assumes that the population distribution of commute times is normally distributed, but she does not know the population standard deviation An environmental scientist is evaluating a soil treatment for acid rain and wants to determine if the pH of the soil of a test site is higher after the treatment. She takes 30 soil samples from random locations around the test site before the treatment and an additional 30 soil samples from random locations after the remediation Last year, a solar panel installation company made n = 1268 residential installations with an average array size of x = 4.9 kW and a standard deviation of = 0.8 kW. The CEO selects a simple random sample of 60 installations from this year to determine if the average size is different from last year. He assumes that the population standard deviation has not changed A marketing analyst wants to determine if the proportion of undergraduate college students that drink coffee differs from the proportion of graduate students. He selects a simple random sample of 55 undergraduate students and 54 graduate students. He finds that 33 of the undergraduate students and 37 of the graduate students are coffee drinkers

Explanation / Answer

1st: --one sample t -confidence interval for mean

2nd: : two sample t test for two independent means

3rd: one sample z test for a mean

4th: two sample z test for 2 proportions

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