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Belsky, Weinraub, Owen, and Kelly (2001) reported on the effects of preschool childcare on the development of young children. One result suggests that children who spend more time away from their mothers are more likely to show behavioral problems in kinder- garten. Using a standardized scale, the average rating of behavioral problems for kindergarten children is m = 35. A sample of n =16 kindergarten children who had spent at least 20 hours per week in child care during the previous year produced a mean score of M = 42.7 with a standard deviation of s=6.
a. Are the data sufficient to conclude that children with a history of childcare show significantly more behavioral problems than the average kindergarten child? Use a one-tailed test with a = .01.
b. Compute the 90% confidence interval for the mean rating of behavioral problems for the popu- lation of kindergarten children who have a history of daycare.
c. Write a sentence showing how the outcome of the hypothesis test and the confidence interval would appear in a research report.
She is also indifferent between L3=(1,B) and L4=(0.7, A; 0.3 C). If Patty wants to take the course that maximizes the expected utility of her ?nal grade, which course should she take?
Mothers did not take the drug DES during pregnancy , what is the estimate of the number of women out of 1000 who would be expected to have tissue abnormalities?
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
A sample proportion is calculated from a sample size of 394. How large of a sample would we need in order to decrease the standard error by a factor of 9?
how can you do a regression analysis on excel to predict your sales for the next 5
In an article in the Journal of Management, Morris, Avila and Allen studied innovation by surveying firms to find the number of new products introduced by the firms.
What sample size is needed to detect the difference of 10 in a 0:05-level testing against the two sided alternative with power and can you find any statistical evidence showing that the two gray levels are significantly different
A cable manufacturer has historically averaged 2.6 flaws per 1000 meters length of wire production.
question response time at an online site can be modeled with an exponential distribution with a mean service of 5
In a random sample of 500 families owning sets in the town was found that 340 subscribed to ASTRO. Find a 95% confidence interval for actual proportion of families in this town who subscribe to ASTRO.
If a manager wishes to develop a confidence interval estimate for estimating the difference between two population means, an increase in the size of the samples used will result in:
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
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