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There are 50 industrial firms. An inspector will visit 10 randomly selected to check for violations of regulations. If 15 of the firms are actually violating at least one regulaltion, what is the pmf of the number of firms visited by the inspector that are in violation of at least one regulation?
Provide a 95% confidence interval for the difference between the two population means. Compare the means of population 1 and population 2. Are they equal? Show your test procedure.
A recent study was designed to compare smoking habits of young women with those of young men. A random sample of 150 women revealed that 45 of them smoked.
What assumption tests should be used? A fifth grade science teacher want to know if there is a relationship between final exam scores and overall course points after adjusting for a quiz score.
The data given below are taken from two independent samples collected randomly. What is the value of test statistics?
The hypothesis test produces a z-score of z = -2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision.
The cell phone industry is growing at a rapid pace. Current estimates suggest that 60% of people have cell phones. Suppose 25 people were randomly and independently sampled.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
The time required to assemble a part of a machine follows an exponential probability distribution with a mean of 14 minutes. What is the probability that the part can be assembled in 7 minutes or less?
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.
Washing machines leaving the factory that are defective. Obtain a sample size that will ensure a margin of error of at most 0.014 for a 97% confidence interval.
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
If die is loaded so that 6 comes up with probability 0.2 and probabilities of 2,3,4, and 5 faces are not affected, determine the assignment of probabilities to the six faces?
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