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1. The weights of all candy bars of this type are certainly not constant because of slight variations in the factory production process. Assume these weights vary according to a normal distribution with mean \mu=2.2 and population standard deviation \sigma=0.04oz . The quality control department checks weights of all candy bars before shipment to stores. It has been company policy to not ship any bars that would be in the lowest 7% of weights. Below what weight would identify, or cutoff, the lowest 7%?
2. If you roll a sum of 7 or 9 on one toss of a pair of dice you win $25. The cost to play the game is $3.00. Theoretically, how much would you expect to win (or lose) if you played the game 1000 times?
(Identify whether your answer is a gain or loss.)
A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination.
A mathematical placement test is given to all entering freshmen at a small college. A student who receives grades below 35 is denied admission to the regular mathematics course and placed in a remedial class.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
the national association of realtors released a survey indicating that a surprising 43 of first-time home buyers
How would you describe the function of a generalized linear regression model?
What is the probability that a randomly selected vehicle's VMD will lie between 60,000 and 100,000 miles since its previous crash?
What is the probability that in January of 2003 a randomly selected worker spent fewer than 50 hours per month logged on to the Internet?
suppose that the correlation r between two quantitative variables was found to be r 0. this means thatthere is a
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
a prospective cohort study showed that 200 new cases of disease x occurred in 2000 person-years. calculate the
Is there sufficient evidence for concluding that true average repair time exceeds 200 min? Carry out a test of hypotheses using a significance level of .05.
A group of 20 sales associates agree to go through a week-long sales class to improve their productivity. The amount of their sales are computed for one month before and one month after the training course.
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