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In one state, 52% of the voters are Republicans, and 48% are Democrats. In a second state, 47% of the voters are Republicans, and 53% are Democrats. Suppose a simple random sample of 100 voters are surveyed from each state.
What is the probability that the survey will show a greater percentage of Republican voters in the second state than in the first state?
(A) 0.04
(B) 0.05
(C) 0.24
(D) 0.71
(E) 0.76
Three hundred students took a chemistry test. You sampled 50 students to estimate the average score and the standard deviation. How many degrees of freedom were there in the estimation of the standard deviation
A company counted the number of employees at each level of years of service in the following table. What is the average number of years of service in this company?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
In a classical experiment, Gregor Mendel observed the shape and color of peas that resulted certain crossbreedings. A sample of 556 peas was studied with the result that 315 produced round yellow,
m. cottelerr electronics supplies microcomputer circuitry to a company that incorporates microprocessors into
The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the standard error of the mean?
if in an observational study the statistical analysis has shown convincing evidence that the mean levels differed in
Sum of shaded area is equal to one. Smoothed histogram or density curve. How we view the "distribution" of a dataset can depend on how much data we have and how it is binned.
a blackjack consists of two cards one of which is an ace and the other of which is a 10-point card either a 10 jack
You are dealt one card from a 52- card deck. Then the card is replaced in the deck, the deck is shuffled, and you draw again. Find the probability of getting a picture card the first time ad a spade the second time.
Scientist does n ot believe that water ph is 7. She wants to test the null hypothesis that the true level of ph is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a ph of 7. Which p-value will she reject..
barrons reported that the average number of weeks an individual is unemployed is 17.5 weeks barrons february 18 2008.
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