If n=240 and ˆpp^ (p-hat) =0.91, find the margin of error at a 90% confidence level Give your answer to three decimals

If a distribution has a mean of 46 and a standard deviation of 1, what value would be -2 standard deviations from the mean?

The mean of a distribution is 15 and the standard deviation is 3. Use Chebyshev's Theorem and the formula 1 - 1 / (k ^ 2) to determine the minimum percentage of values that will fall between 9 and 21

You are performing a two-tailed test with test statistic z = -2.003, find the p-value accurate to 4 decimal places. p-value =

Historically, the proportion of students entering a university who finished in 4 years or less was 63%. To test whether this proportion has decreased, 120 students were examined and 52% had finished in 4 years or less. To determine whether the proportion of students who finish in 4 year or less has statistically significantly decreased (at the 5% level of signficance), what is the p-value? (please round your answer to 4 decimal places)

The chart to the right shows that a professor's grading distribution is bell shaped, or normally shaped. The mean of the distribution is 74 and the standard deviation is 9. Using a Continuous Variable Normal Bell Distribution Model, calculate the minimum test score needed to score in the top 5% of the class. Complete your work in the worksheet by listing the formula inputs, labels for the formula inputs and make your calculations with formulas. This test problem is similar to what you studied in video # 32, 33 and 34 and homework problems # 17, 21 and 23. Relative Frequency Frequency Professor looks at all test score for a particular test (this is population data), and observes: 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Mean = 74 Median = 74 Mode = 73 SD=9 0 0 0 up to 10 up 10 to 20 0 20 up to 30 0 30 up to 40 2 40 up to 50 29 50 up to 60 X = Score 112 60 up to 70 225 70 up to 80 111 80 up to 90 21 2 90 up 100 up to 100 to 110

A marketing firm wanted to estimate the proportion of protected homes today. It chose a random sample of 283 homes and discovered that 95 had home security systems. Estimate the lower bound limit of the true proportion of homes with security systems with 95% confidence.   Round your answer to 3 decimal places.

You are performing a two-tailed test with test statistic z=−2.856z=-2.856, find the p-value accurate to 4 decimal places.p-value =

Solve using the z score table P(xs 5) O = 3 Z = X-u_ Fill in the graph to represent the desired shaded area and standard deviation line.