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During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard deviation 8 mph. A simple random sample of 55 cars is obtained. 7. Find P(T < 44) 8. Interpret the answer from #7 as a proportion.

During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard deviation 8 mph. A simple random sample of 55 cars is obtained. 7. Find P(T < 44) 8. Interpret the answer from #7 as a proportion.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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The following questions are from Chapter 8. Recall that, if n > 30, we say the sampling distribution of T is approximately normal with u = u and o = During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard deviation 8 mph. A simple random sample of 55 cars is obtained. 7. Find P(T< 44) 8. Interpret the answer from #7 as a proportion. The following questions are also from Chapter 8. Recall that, if np(1-p) > 10, the sampling distribution p(1-p) of p is approximately normal with u6 = p and n A survey shows that 64% of American teenagers want to be eventually be self-employed. A simple random sample of 540 teenagers is obtained. 9. Find P(p< .61) 10. Would it be unusual to find that 400 or more teenagers in our sample wanted to eventually be self- employed?
Transcribed Image Text:The following questions are from Chapter 8. Recall that, if n > 30, we say the sampling distribution of T is approximately normal with u = u and o = During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard deviation 8 mph. A simple random sample of 55 cars is obtained. 7. Find P(T< 44) 8. Interpret the answer from #7 as a proportion. The following questions are also from Chapter 8. Recall that, if np(1-p) > 10, the sampling distribution p(1-p) of p is approximately normal with u6 = p and n A survey shows that 64% of American teenagers want to be eventually be self-employed. A simple random sample of 540 teenagers is obtained. 9. Find P(p< .61) 10. Would it be unusual to find that 400 or more teenagers in our sample wanted to eventually be self- employed?
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