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Stem Cell Survey - Adults were randomly selected for a Newsweek poll. They were asked if they "favor or oppose using federal tax dollars to fund medical research using stem cells obtained from human embryos." Of those polled, 481 were in favor, 401 were opposed, and 120 were unsure. A politician claims that people don't really understand the stem cell issue and their responses to such questions are random responses equivalent to a coin toss. Excuse the 120 subjects who said they were unsure, and use a 0.01 significance level to test the claim that the proportion of subjects who respond in favor is equal to 0.5. What does the result suggest about the politician's claim?
An experiment was conducted to determine the effects of three different pesticides (P1,P2,P3) on the yield of three different varieties of citrus tree (V1,V2,V3).
Suppose the salary of assembly line workers has Normal distribution with mean of $20,000, and standard deviation of $3,000.
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Assume that a random variable, x, is distributed according to a normal distribution with mean 12 and standard deviation 2. Find the z-value if:
Do these scores suggest that the different foods are differentially preferred by people in general? (Use the .05 significance level.)
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
How does your sample compare to this theoretical distribution of sample means and what are the mean, variance, and standard deviation of the observations in your sample?
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
Explanation on what is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient?
If garage is robbed, determine the probability doors were left open?
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