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Suppose the people living in a city have a mean score of 48 and a standard deviation score of 7 on a measure of concerns about the environment. Assume that these concerns are normally distributed using the 50%- 34% - 14% figures. Appoxatmaily what percentage of people have a score A. Above 48 B. Above55 C. Above 34 D. Above 41 E. Below 48 F. Below 55 G. Below 34 H. Below 41
A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5. Compute the value of the test statistic.
Explain your findings (including the logic of comparing within-group to between-group population variance estimates, how each of these is figured, and the F distribution).
In terms of p , the researcher should test which of the following null and alternative hypotheses?
State the alternative hypothesis that would be used to determine if Brand A has a higher proportion of defective smoke detectors than Brand B. Calculate the test statistic for determining if a difference exists between the failure rates of the two..
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
From the given polynomials, identify the polynomials of degree one. I know that I have to use the substitution methode and the elimination. I am not sure if I applied the correct system.
Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
A box contains 3 blue marbles and two red marbles. If two marbles are drawn randomly and without replacement, find the probability that (a) at least one of the marbles is blue
If the standard deviation of the population is 9 hours, determine whether there has been a significant increase in battery life expectancy.
Assume that the distribution of heights of adults American normally distributed, with mean 69 inches and standard deviation 2.8 inches.
A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00.
The number of viewers of American Idol has a mean of 33 million with a standard deviation of 10 million. What is the probability that next week's show will: Have between 37 and 44 million viewers?
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