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1. Suppose a research firm conducted a survey to determine the average amount of money steady smokers spend on cigarettes during a week. A sample of 100 steady smokers revealed that the sample mean is $20 and the sample standard deviation is $5. What is the probability that a sample of 100 steady smokers spend between $19 and $21?
2. Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The average tread wear was found to be 50,000 miles with a standard deviation of 3,500 miles. What is the best estimate of the average tread life for the entire population of these tires?
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
Fawns Fawns among1 or 5 months old in Mesa Verde National Park have a body weight that is approximately normally distributed with mean
The following data from a sample of 100 families show the record of college attendance by fathers and their oldest sons: in 22 families, both father and son attended college; in 31 families, neither father nor son attended college; in 12 families,..
Suppose that the number of babies born during an hour at a hospital's maternity wing follows a Poisson distribution with a mean of 4 per hour.
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
The casino game craps is based on rolling two dice. Here is the assignment of probabilities to the sum of numbers on the up face when two dice are rolled:
Romance USA present reported that 11 percent of all books sold are of the romance genre. If a local bookstore sells 316 books on a given day
Simulate both one-and two-teller systems, calculate waiting time, average queue length, and percentage utilization for each system.
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
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