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A number x is formed by choosing six digits in order, each being a 9 or a 1 and equally likely. compute the probabiliy of each of tghe following events
If several years pass and you want to conduct a new survey to estimate the mean length of time that car owners plan t keep their cars, how many randomly selected car owners must you survey?
You purchased 169 of these bulbs with the idea that you would purchase more if the mean life of your sample were more than 780 hours. What is the probability that you will not buy again from this ma
The economist needs to know how large a sample should be taken so that a 90% confidence interval for their mean income with an error of $500 can be constructed. If the population standard deviation
A company that sells annuities must base the annual payout on the probability distribution of the length of life of the participants in the plan. Suppose the probability distribution of the lifetime
Calculated these total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years
Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume pulse rates are normally distributed. State the null and alternate hypotheses
Suppose you arrive at the decision that there is not enough evidence to reject the null hypothesis, could you have made a mistake? What type of error would result in that case?
If the age of a sample of seven employees of a fast-food outlet (X) are as follows: 19, 19, 65, 20, 21, 18, 20 (1) Compute the best central measure.
Assuming that the volume printed on each container is 1 gallon, how would you formulate the null and alternative hypotheses to test the customers' claim?
Based on the 2000 Census, 31.8% of grandparents in California are the primary caregivers for their grandchildren Suppose n = 1000 persons are to be sampled from this population and the sample propor
Suppose that you draw a random sample of 27 cans. Find the probability that the mean weight of the sample is less than 6.19 ounces.
Do you think that this sample might have come from a normal population? Why or why not?
There are 3 gene types S1, S2 and S3 in a large population. They each have the relative frequency of a^2, 2a(1-a) and (1-a)^2 respectively where "a" is the gene frequency. Suppose that in a random s
For a candidate who guesses at all answers, find the mean and variance for the random variable X, the number of correct answers.
A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval. What happens to the required sample size if the confidence level is increased from 95%
(a^2), (1-a)^2 and 2a(1-a) are the relative frequency for the outcomes genotype S1, S2 and S3 respectively where "a" is the gene frequency.
Using what you know about t-scores, identify which of the variables have a significant influence on the LISTPRICE. At a level of 1% which variables are significant?
To verify that the random numbers really were from a uniform distribution, the auditor calculated the mean and standard deviation of the random numbers. What should the mean and standard deviation b
Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 100 minutes and a standard deviation of 15 minutes. What proportion of 1040R tax forms will be comp
The monthly demand for a product is normally distributed, with a mean of 700 units and a standard deviation of 200 units. What is the probability that demand will be greater than 900 units for a mon
Suppose a bar buys 10 of these sony tvs what is the probability that the average life time of the bar's tv is less than 19,650 hours.
What is the difference between a statistic and a parameter, and how does this difference related to the topic of inferential statistics?
Find the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the contest?
If 1.5 million X-Games were sold over the holidays, determine an interval for the number of defectives in sales. 12,184 to 32,816.