Question: Question: 1 (a) If a good typist can input 70 words per minute, but a 99% confidence interval for the mean number of words input

Question: 1

(a) If a good typist can input 70 words per minute, but a 99% confidence interval for the mean number

of words input per minute by recent applicant lies entirely below 70, what can you conclude about the

typing skills of recent applicants?

(b) Are nursing salaries in Tampa, Florida, lower than those in Dallas, Texas? Salary data

show staff nurses in Tampa earn less than staff nurses in Dallas (The Tampa Tribune, January

15, 2007). Suppose that in a follow-up study of 40 staff nurses in Tampa and 50 staff

nurses in Dallas you obtain the following results.

Tampa Dallas

n1=40 n2 = 50

x1 = 56, 100 x2 = 59400

s1 = 6000 s2 = 7000

i. Formulate hypothesis so that, if the null hypothesis is rejected, we can conclude that

salaries for staff nurses in Tampa are significantly lower than for those in Dallas.

Use = 0.5.

ii. What is the value of the test statistic?

iii. What is the p-value? What is your conclusion?

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