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In a study of elephants a researcher wishes to determine the average weight of a certain subspecies of elephants. From previous studies, the standard deviation of the weights of elephants in this subspecies is known to be 1500 pounds. How many elephants does the researcher need to weigh so that he can be 80% confident that the average weight of elephants in his sample is within 350 pounds of the true average weight for this subspecies?
A. 31B. 39C. 50D. 166
What is the probability the average of the sample is more than $38000 and What is the standard deviation of the sample mean
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
Do you benefit by using a cum sum chart rather than a control chart?
A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats.
Determine the strength of the causal relationship between monthly sales and new home construction by using correlation.
When a sample mean is greater than the true, population mean, the resulting difference is called:
Assume a customer has a two-attribute value function for cars: cost and quality. Cost can range from $5,000 to $10,000 and quality can range from 0 to 10 (a higher score is better).
Here are fifty observations on the weight of tea bags. Calculate the Standard Deviation and Variance.
The heights of 40 randomly selected people and the heights of their mothers are recorded. Statdisk is used to run a linear correlation and regression analysis. The partial results are provided below:
Create a 98 percent confidence interval for the population mean.
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
Plot the data on the same line and give your impression regarding any apparent differences between the two companies.
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