A local birth center believes that the length of human pregnancies (with no comp

Question

A local birth center believes that the length of human pregnancies (with no complications from conception to birth lasts longer than 260 days. A random sample of 58 pregnancies lasted an average of 258 days with a standard deviation of 9.5 days. 18. What are the appropriate hypotheses? A. H0 mu 260 B. Ho: mu lessthanorequalto 260, Ha: 260 A Ho: u 260, Ha: 260 C Ho: mu 260, Ha: mu 260 D. Ho: mu lessthanorequalto 260, The Type II error for this test would be to conclude that A. the true average length all pregnancies is at least 260 when it is less. days, B, the true average of is more than 260 it is really less. C. the true average length pregnancies is not more than 260 days, when it is really of D, the true average length of pregnancies is greater than 260 hours, when it isreally less. 20. Which distribution should be used to the construct a confidence interval and perform a hypothesis A. N(258, 9.5 Squareroot 38) B. N(260, 9.5 58) c. I_57 D. More information is needed. 21. Construct and interpret a 90% confidence interval for the true length of human pregnancies. A. The length for 90% of all samples will be between 255.95 and 260.05 days. days. B. We are 90%confident that the true average length is between 255.91 and 260.09 C. 90% of all samples will give a confidence interval of between 25595 and 260.05 days. D. We are 90%confident that the true average length is between 255.95 and 260.05 days. 22. The length days of one pregnancy represents: D. A statistic C. A variable B. A parameter A. Data following distributed between The amount of time between pauses on a computer terminal is uniformly 0.2 and 0.8 seconds. 23. Find the probability that the amount of time between pauses will exceed 0.68 seconds. D. 0.2 C. 0.88 B, 0.12 A. 0.80 24. Find the minimum amount of time the longest 83% of pauses last A. 0, 302 seconds B. 0, 498 seconds C. 0.136 seconds D. 0.370 seconds

Explanation / Answer

1- Null sypothesis and alternate hypothesis need to be defined here. Answer is D.

2 -Type 2 error is a false negative, Hence the answer here is C.

3 - A . Mean is 258 and standard deviation is 9.5 * sqrt (58)

4 - A , This is the definition of confidence interval. A 90% interval means that 90% of all values will lie within it.

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