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For 5459 pregnant women using Aarhus University Hospital in Denmark in a two-year period who reported information on length of gestation until birth, the mean was 281.9 days, with standard deviation 11.4 days. A baby is classified as premature if the gestaion time is 258 days or less.
a. if gestation times are normally distributed, what proportion of babies would be born prematurely?
b. The actual proportion born prematurely during this period was 0.036. Based on ths information, how would you expect the distribution of gestation time todiffer from normal?
The standard deviation of the sample is $3,000. Interpret your findings.
The heights, in feet, of the five tallest buildings in four large cities are compared. What is the critical value if the level of significance is 0.10?
Do these data provide sufficient evidence to reject the claim made by Creative Good? Two sample F-test for the ratio of population variances
Research question : At α = . 01, is degree of certainty independent of credits earned?
The mean time between failures is found to be 322.4 hours for a sample group. assuming that s= 45.0 hours, find the 99% confidence interval for the mean time between failures for all such radios.
The manufacturer wanted to determine if the tires were exceeding the guarantee. At the .05 significant level, it was concluded that the tires are exceeding the manufacturer's guarantee.
A contractor is considering a sale that promises a profit of $31,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $13,000 with a probability of 0.3. What is the expected profit?
Construct a 99% confidence interval for the difference in the proportions of college freshmen and sophomores who purchased used textbooks.
A. What is the probability that an employee will have a cold next year?b. Given that an employee is involved in an exercise program, what is the probability that he or she will get a cold next year?c. What is the probability that an employee who is n..
The rockets are playing Lakers tonight in basketball. The lakers average 90 points a game, with a SD of 10. What would the rockets need to score to be 80% sure of victory, 90% sure, 95% sure.
Are these results sufficient to conclude that the self-hypnosis has a significant effect? Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use an alpha of .05."
sampling variability and standard errorproblem 1people in a large population average 60 inches tall.nbsp you will take
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