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The effect of sample size on the standard deviation. Assume that the standard deviation in a very large population is 100.
Provide answers to the following items (a) - (c):
(a) Calculate the standard deviation of the sample mean for samples of size 1, 4, 25, 100, 250, 500, 1000, and 5000.(b) Graph your results with the sample size on the x axis and the standard deviation on the y axis.(c) Summarize the relationship between the sample size and the standard deviation that you showed in your graph.
Three cards are randomly selected from an ordinary deck of cards without replacement Compute the probability that the first card is a spade given that the second and third are spades.
To obtain the probability that the mean wage of 75 randomly selected workers will exceed $43,000
Assume you want to estimate the population proportion,p, and the estimator for the mean proportion (p-hat)= 0.34, N = 6000, and n = 1300. Find an approximate 95% confidence interval for p.
What is a Wilcoxon-Whitney Test and when is it used? I am not sure when to use the Wilcoxon-Whitney Test and what it is testing.
A number x is formed by choosing six digits in order, each being a 9 or a 1 and equally likely. Describe the sample space and count the number of sample points it contains.
In a field study of mating behaviour in the Mormon cricket, a biologist noted that some females mated successfully while others were rejected by the males before coupling was complete.
At.01 significance level is it sensible to conclude that modification decreased the number of traffic accidents?
A mean time of 90 minutes and standard deviation of 18 minutes. What proportion of new typists need between 1 and 2 hours to learn the computer system?
We have discussed two different methods for making statistical inferences such as developing interval estimates and conducting hypothesis tests. These methods are the "Critical Value Method" and the "P-Value Method".
If the coefficient of correlation is 0.4, the percentage of variation in the dependent variable explained by the variation in the independent variable
A student scored 84 points on a test where the mean score was 79 and the standard deviation was 4. The student's z score was:
What is the chance that the number who say "yes" in a properly drawn random sample of 500 will be smaller than 360?
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