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The average salary for a certain profession is ?$75,500. Assume that the standard deviation of such salaries is ?26,000. Consider a random sample of 66 people in this profession and let
x represent the mean salary for the sample.
What is μx??
What is σx??
Find the? z-score for the value x equals 68,000.
Find Upper Px>68,000.
When Professor Seuss conducted the same experiment, the means of the two groups were 21.1 and 14.7, but the difference was statistically significant. Explain how this could happen.
Make a purchase using the internet. Test the claim that the proportion of consumers ages 35-44 who plan to make purchases using the internet has increased at α = 0.01.
a. Write down the point estimate for µ along with its standard error. b. Write down the margin of error at 0.8 con?dence level. c. Write down the 80% con?dence interval estimation for µ based on this sample.
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
What is the probability that the mean salary is less than $58,000? Summer standard deviation is $6,200. (Round to nearest four decimal places)
Test for normality of the variables Temperature, Relative humidity and Wind separately using normal probability plot - Construct a 95% confidence interval for each of the variables in part (a).
a random sample of 121 checking accounts at a bank showed an average daily balance of 280. the standard deviation of
Do the above values appear to be in statistical control, justify your answer?
The true average gas mileage for this new model, which of the following gives the null and alternative hypotheses that the consumer group should test?
Fat, Calories, and Carbohydrates A nutritionist established a significant relationship among the fat content. Predict the number of calories in a snack which contains 10 g of fat and 19 g of carbohydrates.
From Conditional distribution and the Bivariate Normal distribution.
What is the probability that next week's show will: Have between 30 and 37 million viewers? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.
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