3. A group of friends debated whether more men use smartphones than women. They consulted a research study of smartphone use among adults. The results of the survey indicate that of the 973 men randomly sampled, 379 use smartphones. For women, 404 of the 1,304 who were randomly sampled use smartphones. Test at the level of significance.

1.State the two hypotheses

a.Ho: P1 P2

b.H_a: P1 > P2

2.Summarize the data

3.Draw the distribution

Normal Distribution:

4.Find the z-value/t-value/chi²-value and p-value

Test the statistic:

P value=

5.Make a decision

6.Write the conclusion in words

4. Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 150 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next 25 flights. The average delay for those 25 flights is 22 minutes with a standard deviation of 15 minutes. Test at the level of significance.

1.State the two hypotheses

a.Ho:

b.H_a:

2.Summarize the data

3.Draw the distribution

Normal Distribution:

4.Find the z-value/t-value/chi²-value and p-value

Test the statistic:

P value=

5.Make a decision

6.Write the conclusion in words