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Of the 460 respondents in a Christmas tree market survey, 41% had no children at home and 59% had at least one child at home. The corresponding figures for the most recent census are 48% with no children and 52% with at least one child. Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census. Give the z statistic (rounded to two decimal places) and the P-value. What do you conclude? (Use (alpha) = 0.10.) z = ? P-value =?
To find the probability values in case of raw data, binomial, normal
Mean of 61 minutes and a standard deviation of 9 minutes. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion.
What happens to the boundaries for the critical regions?
Whose characteristics can be assume to be independent of each other, were examined. Let X denotes the number of defective computer chips.
List the steps involved in hypothesis testing using: a) the traditional/classical method; b) the probability-value method. Provide an example of each.
For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
Using binomial distribution find the probability that 2 or 3 women in a sample of 20 will never be married.
Develop a point of the population standard deviation for life expectancy of VCRs.
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
The following data are from two separate samples. Does it appear that these two samples came from the same population or from two different populations?
A PC manufacturer claims that no more than 2% of their machines are defective. In a random sample of 100 machines, it is found that 5% are defective. The manufacturer claims this is a fluke of the sample.
A survey of 500 internet users found that the users were online an average of 6.5 hours a week with a standard deviation of 3.1 hours. If 49 internet users are randomly selected what is the probability that their average time online will be more t..
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