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1. The credit manager of a discount sports equipment store believes that the average age of his charge account customers is 30 years. His deputy contends that the average age is less than 30 years. A random sample of 100 charge account customers showed the mean age as 27 years with a standard deviation of 10 years. Do these data support the deputy's belief? What is the p-value?
2. Exhibit 8-18 According to a newspaper report, the average monthly rent for one-bedroom apartments in Quant City is $790. A local Realtor suspects that the report overstated the average monthly rent. She took a random sample of 50 one-bedroom apartments and recorded an average monthly rent of $825 with a standard deviation of $120.Refer to Exhibit 8-18. What is the p-value for testing if the report overstated the average monthly rent? (Since the sample size is sufficiently large, use z.)
3. How large a sample would be needed to estimate, within 24 hours, the mean burning time of incandescent lamps with no greater risk than one chance in 20 of being wrong. The standard deviation of burning time is 200 hours.?a. 250b. 357c. 189d. 267e. 301
4. The mean monthly expenditure on gasoline per household in Middletown is determined by selecting a random sample of 36 households. The sample mean is $68 with a random sample standard deviation of $17.?Calculate a 90% confidence interval for the mean monthly expenditure on gasoline per household in Middletown.
How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x?
1. the area between z 0 and z 0.8 under the standard normal curve is?round to four decimal places2. for the standard
This problem relates to Basic Statistics and it is about calculate the mean of moviegoers and concluding whether or not the sample can represent the entire population. This has been described in the solution with calculation
when performing a one-way anova the error sum of squares can be obtained by subtracting the treatment sum of squares
Faced with rising FAX costs, a firm issued a guideline that transmissions of 10 or more should bw sent by 2-day mail instead. Wxceptions are allowed, but they want the average to be 10 or below.
Mean and standard deviation are 584.6 and 34.28
a completely randomized experiment with two temperatures factor a two lengths of washing time factor b and five
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
the earths temperature which affects seed germination crop survival in bad weather and many other aspects of
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
Let X1,... x30 be independent Poisson random variables having mean 1. (a) Use Chebyshev's inequality to find a lower bound on the probability.
astronomers estimate that as many as 100 billion stars in the milky way galaxy are encircled by planets. if so we may
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