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A manufacturer produces a batch of memory chips (RAM) and measures the mean-time-between-failures (MTBF). The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF. Did the change to the process improve the MTBF?
Four movies are randomly selected. Their lenghts were 110, 96, 125, and 136 minutes. Find a 95% confidence interval of the average of the lenghs of the movie.
Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
A telemarketing company wants to find out if people are more likely to answer the phone between 8pm and 9pm than between 7pm and 8pm.
Sources and Uses of Cash. State how each of the following events would affect the firm's balance sheet. State whether each change is a source or use of cash.
A loan application is received during the day. By hand: Find the probability that the amount requested amount is $90,000 or more? Find the probability that the amount requested is between $75,000 and $90,000?
The cost for the conference room, instructor compensation, lab assistants, and promotion is $9,600. Micromedia rents computers for its seminars at a cost of $60 per computer per day. Question: find the breakeven point for this problem using Excel.
A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .25 hours?
When a fisherman catches a fish, it is a young one with a probability of 0.23 and is returned to the water. On the other hand, an adult fish is kept to be eaten later.
Assume that the average person in America weighs 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the weights collected on a sample of colleges students: 120, 105, 166, 170, 145, 14..
The instructor wanted to "pass" anyone who scored above 69. What proportion of exams will have passing scores?
A business owner decides to use a binomial distribution to solve one of his problems.
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