Consider a test of coordination that has a normal distribution, a mean of 50, and a standard deviation of 10. (a) How high a score would a person need to have to be in the top 3% (b) Explain vour answer to someone who has never had a course in statistic.

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Estimate the population mean by finding a 95% confidence interval given a sample of size 42, with a mean of 51.2 and a standard deviation of 14.6.  Preliminary: Is it safe to assume that �≤0.05 of all subjects in the population? No Yes Is �≥30? No Yes Confidence Interval: What is the 95% confidence interval to estimate the population mean? Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place.95% C.I. =

= 3.5 to z = 4. = 4 to z = 4.5.

Calculate Sam’s GPA and Samantha’s.

The median household income in PA is $60,905, and the median household income in NJ is$85,751. Find the income index number in NJ, using the median income in PA as thereference value. Also write a sentence to explain your numerical answer in words.

A survey by the Boston Globe questioned upper elementary and middle school students about cell phones. 90 students, or 45% of those surveyed, said that they had their own cell phone. How many students were included in the survey?

Please help me answer the following questions. Thank you