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A sample of 66 women over the age of 50 used the new cream for 6 months. Of those 66 women, 30 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 60% of women over the age of 50? Test using ?=0.01.
test statistics z= ____.
rejection region z>____.
In a research study, what does statistically significant mean? How are decisions made on data based on significance? What do you do with data that is not significantly different?
Assume that, the standard deviation of a monthly rents paid by students in a particular town is $40 A random sample of 100 students was taken to estimate the mean monthly rent paid by the whole student population- solution?
a sample of 36 observations is selected from a normal population. the sample mean is 12 and the population standard
Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
q1.ishs butter cookies sells large tins of butter cookies and small tins of butter cookies. the factory can prepare at
If code is 4 random letters, and letters can be utilized multiple times, how many different possible codes are there?
Should we thus conclude that verbal praise tends to lower performance levels, whereas verbal criticism tends to raise them? Or is some other explanation possible?
This set of height measurements are recorded in centimeters. Answer the following questions using the Histogram Applet.
An apple juice producer buys all his apples from a conglomerate of apple growers in one northwest state. The amount of juice squeezed from each of these apples
questions1. compare and contrast internal and external validity. describe and give examples of research questions for
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
How large sample should be selected in order to obtain p estimate with a bound of 0.08 on the error of estimation.
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