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1. An experiment involves selecting a random sample of 256 middle managers at random for study. One item of interest is their mean annual income. The sample mean is commuted to be $35,420 and the sample standard deviation is $2,050. What is the standard error of the mean?
2. The wildlife department has been feeding a specal food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 grams and the standard deviation 8.8 grams. What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?
The researcher computes the sum of squares for groups as SSG = 40030 and the sum of squares for error as SSE = 414780. The numerical value of the ANOVA F statistic is
Find out the following probabilities. Probability that exactly 27 items will be good.
Explain why random samples are preferred to nonrandom samples.
The heights of young women are approximately normal with mean 65 inches and standard deviation 2.5 inches.
Plot fitted values against residuals. Does this plot point out any problems with homoscedasticity?
Based on the Correlation following are Multiple choices question. If the correlation coefficient among two variables is equal to zero, what can be said of the variables X and Y.
If x is a binomial random variable where n = 100 and p = .1, find the possibility that x is less than or equal to 10 using the normal approximation to the binomial.
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
To select a _________ sample, an intact group of subjects that represent the population is selected.
According to the study, the mean age of a self-employed individual is 46.6 years with a standard deviation of 10.8 years.
Utilizing the .05 level, do the results support the psychologists' theory. A psychologist theorized where people can hear better when they have just eaten a large meal.
Assume the data for the three groups are independent and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that
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