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The manufacturer of a quartz travel alarm clock claims that, on the average, its clocks deviate from perfect time by 30 seconds per month, with a standard deviation of 10 seconds. Engineers from a consumer magazine purchase 40 of the clocks and find that the average clock in the sample deviated from perfect accuracy by 34 seconds in one month.
a. If the manufacturer's claim is correct (i.e., seconds, σ = 10 seconds), what is the probability that the average deviation from perfect accuracy would be 34 seconds or more?
b. Based on your answer to part (a), speculate on the possibility that the manufacturer's claim might not be correct.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
How large a sample should he take to be within 200£ of the actual average with 99% confidence? He assumes the standard deviation of total monthly deposits for all customers is about 1000£.
The sum of squared deviations is minimum when taken from___________. (a) Mean (b) Mode
A telemarketer at a credit card company is instructed to ask the next 18 customers that call into the 800 number whether they are aware of the new Platinum card that the company is offering. Of the 18, 17 said they were aware of the program.
Medication, 47% take cholesterol-lowering medication, and 12% take both medications. What is the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication?
Determine the interval width and the class mark for each of the classes in your frequency distribution.- Based on the frequency distribution obtained in part (b), draw a histogram and a relative frequency polygon.
(a) Give a 95% confidence interval for the mean ARSMA score of Mexicans. (b) What assumptions does your condence interval require?
a binomial experiment which has the probability of success for one trial p 0.63 is being observed and 70 trials are
each year ratings are compiled concerning the performance of new cars during the first 90 days of use.suppose that the
In one paragraph, describe the conclusion you would reach about the participants' performance if the P-value of the hypothesis test was determined to be .065. Include the rationale for your conclusion.
A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that IQ scores follow a normal distribution. Her random sample of 28 IQ scores has a mean of 101 and a standard deviation of 14.7. Find the 95% confidence..
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