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The average weekly earnings of the plumbers in a city is [Mu=$750] with a standard deviation of [s=$40]. Assume that we select a random sample of [n=64 plumbers], what is the probability that the sample mean [x] will be greater than $740 or greater than $755?
a. 0.0228
b. 0.1587
c. 0.3413
d. 0.4772
e. None of the above answers is correct.
The average revenue per retail user
Four out of five doctors prefer Fred's Aspirin." Thinking about sampling and exhaustive categories, what is wrong with this statement? Can you think of other, similarly misleading statements?
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Discuss the data that the graph is used to visually represent. Speculate on why the editor chose the graph, as opposed to merely reporting the data.
Compute mean, median, mode, first and third quartile and compute the variance, standard deviation, range, interquartile range, coefficient of variation, standard error of the mean and Z scores.
The length of the snake Vipera bertis (X), measured in centimeters, is assumed to be normally distrubuited with mean 63 and variance 22. The weight (Y) is measured on grams, can be calculated by using Y= -300 + 7x.
Statistics from Cornell's Northeast Regional Climate Center indicate that Ithaca, NY, gets an average of 35.4" of rain each year with a standard deviation of 4.2". Assume the data is normally distributed.
Collect a real data set consisting of a sample of at least forty observations
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What research design was used this study
Calculate the total tax bill for both low and high income individuals in both countries and fill in the table above with your results and what is the unemployment rate
Select a statistical concept. Here is a general (somewhat broad) listing of concepts covered in the second part of your course: •Estimating a population mean with confidence: discuss confidence interval estimation, the interpretation of the inte..
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