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Two hundred students are enrolled in an Economics class. After the first examination, a random sample of 6 papers was selected. The grades were 65, 75, 89, 71, 70 and 80.
a. Determine the standard error of the mean.
b. What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why.
c. Assume the assumption of Part b is met. Provide a 95% confidence interval for the mean grade of all the students in the class.
Write the claim as a mathematical sentence. Stating the null and alternative hypotheses, and identify which represents the claim.
Estimate the mean height to within 3cm with 95% confidence. Assume the population standard deviation is about 12cm. What sample size should she use?
A manuscript is sent to a typing firm consisting of typists A, B, and C. If it is typed by A, then the number of errors made is a Poisson random variable with mean 2.6; if typed by B, then the number of errors is a Poisson random variable
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
Write the regression. Interpret the regression constant and regression coefficient. Forecast a value for monthly salary.
let fx ae-2x - e-3x for x gt or equal to 0 and fx 0 elsewhere. find a so that fx is a probability density
A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random sample of 36 fish is taken from the tank.
A random sample of 50 men, 40% said they preferred walking up stairs than taking the elevator. In a random sample of 40 women
find the minimum usual value and the maximum usual value whenn 270 and p frac14.a minimum 60.38maximum 74.62b minimum
Test whether the mean weight is less than 10 pounds. Use P-value approach.
Construct a frequency distribution and construct a histogram for the following data and use seven intervals, starting with 30-39.
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