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Question: A study randomized children aged 5 to 12 to either a new intervention for higher calcium levels or to standard care (16 per group). The mean increase in calcium levels for the intervention group was 978 with a standard deviation of 313. In the control group the mean change was 773 with a standard deviation of 268.
a) What is the rejection region for this test? (df=n1+n2-2)
b) Test at a=0.05 if there is a statistically significant difference in mean change in calcium levels between the two study groups.
What are the main difference between the frequency distribution of continuous data and discrete data and how would you present a continuous data as though discrete?
Lane Braintwain is quite a popular student Lane receives, on the average, four phone calls a night (Poisson distributed).
29. The mean preparation fee H&R Block charged retail customers last year was $183 mit Wall Street Journal, March 7, 2012). Use this price as the population mean and assume the bpopulation standard deviation of preparation fees is $50.
The mean of a population of raw scores is 50 (ox=18). What is the probability of randomly selecting a sample of 40 score having a mean above 46?
(a) A marketing agent asked people to rank the quality of a new soap on a scale from 1 (poor) to 5 (excellent). The level of this measurement is
a researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. prior to
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(a) Construct an ogive for the reaction times given in Exercise 116. (b) Construct an ogive representing the cumulative percentage distribution.
Use these two variables to answer the following questions: Depression and Drug Use.
At a level of significance of 1%, would you claim that the new design is better than the old one?
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