# Math 221 week 5 quiz

We provide assignment, homework, discussions and case studies help for all subjects DeVry-University for Session Describe the statistical study. Determine whether the underlined numerical value is a parameter or a statistic.  We provide assignment, homework, discussions and case studies help for all subjects DeVry-University for Session In a normal distribution, which is greater, the mean or the median? The systolic blood pressures of a sample of adults are normally distributed, with a mean pressure of millimetres of mercury and standard deviation of 3.

Complete parts a through c below. For the standard normal distribution shown on the right, find the probability of z occurring in the indicated region. Find the indicated probability using the standard normal distribution. Assume a member is selected at random from the population represented by the graph.

Assume the variable x is normally distributed. In a recent year, scores on a standardized test for high school with a 3. Use the normal distribution of fish lengths for which the mean is 10 inches and the standard deviation is 2 inches.

Use the normal distribution of fish lengths for which the mean is 10 inches and the standard deviation 2 inches. Find the indicated z-score shown in the graph to the right.

Find the z-score that has Use the central limit theorem to find the mean and standard error of the mean of sampling distribution. Then sketch a graph of the sampling distribution. Find the probability and interpret the results.

A random sample of 34 gas stations is drawn from this population. Find the margin of error for the given values of C,S, and N. You are given the sample mean and the sample standard deviation.

Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A doctor wants to estimate the HDL cholesterol of all 20 to 29 year old females.

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How does decrease in confidence affect the sample size required? Find the margin of error for the given values of c, s, and n. In a survey of adults, say they have started paying bills online in last year?Click on the map or use the pull-down menu to find your location-specific resources.

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