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Chocolate bars produced by a certain machine are labeled with 8 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. What proportion of chocolate bars weighs less than 7.92 oz?
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of a pain relief drug is normally distributed with mean 2 hours and standard deviation 0.3 hour.
Could you explain the Pearson or product-moment correlation? If we were to use a partial correlation, would you want to look at the relationship between two variables while removing the effect of one or two other variables?
If np ≥ 5 and nq ≥ 5, estimate P (more than 5) with n=14 and p=0.3 by using the normal distribution as an approximation to the binomial distribution; if np
Testing for population mean - What happens as you use different levels of significance? Different values of the standard deviation?
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Calculate the range, variance, and standard deviation for these sample data.
At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
Assuming the validity of this premise, among 25 randomly selected current customers, what is the probability that between 2 and 6 (inclusive) qualify for membership?
Are the events "Republican" and "30-44" independent? Justify your answer. Are the events "Democrat" and "65+" independent? Justify your answer.
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