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A sample of 40 observations is selected from one somewhat normal population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The sample mean was 99 and the standard deviation was 6. Conduct a test of the hypothesis using the .04 level of significance.
A recent report from the American Medical Association claims that for the first time in ten years, the average salary of psychiatrists was greater than $190,000 with a standard deviation of $27,000. What is the null hypothesis for his claim?
He argues that regression effect says people who do very poorly in their previous job tend to perform well in their next job. Is this what the regression effects? Describe in detail.
Determine the P value for the indicated hypothesis test with given standardized test statistic, z. Make decision whether to reject H0 for given level of significance deviation.
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $57,045 and the median household income was $42,148.
How many observations were in the original data set? In the bottom row of the stem and leaf display identify the stem the leaves and the numbers in the original data set represented by this stem and its leaves.
Organize data into a frequency distribution. How many classes would you propose? What value would you propose for class interval?
Utilizing a binominal experiment, that is each trail can be reduced to two outcomes, construct a binomial distribution.
Suppose the least squares regression equation is Y' = 1,202 + 1,133X. When X = 3, what does Y' equal?
An element E has a constant failure rate λ and a reliability at time t of R(t)=p, if p=0.5 and 0.9, what is the effect on Rs(t), basic reliability, serial Mean Time Between Failure, hs(t), MTBFs if additional elements are added to the baseline sys..
If they must form an ethics subcommittee of 4 members, how many different subcommittees are possible?
Use alpha level. 05 to compute and interpret Pearson's r and to test whether it is important (using all your steps for hypothesis test).
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be:
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