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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.
In a survey of 100 viewers, 36% indicated that they watch the late evening news on this local CBS station. What is your decision if α = 0.01?
1. What are degrees of freedom? How are the calculated? 2. What do inferential statistics allow you to infer?
He continues this until he draws a number that is less than the comparison value, at which point he continues his interrogation. If he draws a 3 as the comparison value, what is the expected number of lashes you will receive for that question?
A sample of n=9 scores is obtained from a normal population distribution with o-=12. The sample mean is M=60.
A part of our research design is the data collection process. We often do this by sampling. Differentiate between random and nonrandom sampling methods.
a psychologist is investigating the hypothesis that children who grow up as the only child in the household develop
suppose that a random sample of 41 state college students is asked to measure the length of their right foot in
suppose a fast food restaurant wishes to estimate average sales volume for a new menu item. the restaurant has analyzed
question assume that the mean systolic blood pressure of normal adults is 122 milliliters of mercury with a standard
in the normal model n10016 for iqs what cutoff values bound the middle 80 of all iqs?a79.50 and 120.50b86.53 and
current research indicates that the distribution of the life expectancies of a certain protozoan is normal with a mean
Find the average age at which people will experience their first cardiac incident, given that 17% of all initial cardiac incident victims are younger than 50. Please, interpret the result.
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