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In a sample of 30 randomly selected women, it was found that their mean height was 63.4 inches. From previous studies, it is assumed that the standard deviation is 2.4.
1) Determine the minimum required sample size to construct a 99% C.I. for the population mean if estimate must be within .8 inch of the population mean.
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
Is there a method which is accepted across industries for determining the minimum size of valid sample? N>50 +(8m aka 8 times the number of independent variables)
Explain in detail and give an original example of the four types of probability.
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
In a recent survey 35 percent indicated chocolate was their favorite flavor of ice cream. Suppose we select a sample of 10 people and ask them to name their favorite flavor of ice cream.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
In a 1993 survey of 560 college students, 171 said that they used illegal drugs during the previous year. In a recent survey of 720 college students, 263 said that they used illegal drugs during previous year.
You are asked to match three songs with the performers who made those songs famous. if you guess, the probability distribution for the number of correct matches is:
Primary healthcare workers believe that anaphylactic shock reaction to immunization injections occurs with children in one case in two thousand.
A pediatrician is interested in studying the effect of Motrin on reducing temperature in young children. Four children with influenza have their temperatures taken immediately before and then 20 minutes after taking a standard dose
The store manager is under impression that his sales people do more business if they score higher on the social skills test which was administered this year. 5 victims were selected at random. Below, the results are X =test score, Y =weekly sales ..
Suppose there is no cyclical component. Quarterly billing for water usage is shown below describe summer billing for year 5.
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