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The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then complete the table below.Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
The lower limit of the 90% confidence interval =The upper limit of the 90% confidence interval =
Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
What control chart(s) would you use for this data and what are the final control limits?
Suppose the time necessary to process an application for a license plate for a newly purchased vehicle is normally distributed with mean of 6 minutes and standard deviation of 1.5 minutes.
A sample of students attending Southeast Florida University is asked the number of social activities in which they participated last week. The chart below was prepared from the sample data.
What is the null hypothesis? Use a = 0.05 .
A group of day to day workers can work either 0 hours, eight hours or 12 hours at a pay rate of $9.75 per hour. (The 12 hour day pays regular time for the first eight hours and double time for the remaining four hours.
Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sampl..
You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667.
A range of values constructed from sample data so that the parameter occurs within that range at a specified probability is:
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
The time until a component is taken out of service is uniformly distributed on 0 to 8 hours. Two such independent components are put in series, and the whole system goes down when one of the components goes down.
Show all the steps of your hypothesis test including a) the claim being tested , b) the null and alternative hypothesis, c) the test statistic, d) the p value, e) initial conclusion, and f) a final conclusion about the original claim.
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