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The average salary of a sample of 14 teachers in a school building with a Master Degree is $32,741 with a standard deviation of $5,800. A sample of 12 teachers in the same building without Master Degrees have an average salary of $27,839 with a standard deviation of $7,400. At the 0.01 significance level, do teachers with Master Degrees have higher salaries?
A baseball player gets a hit in 30 out of 100 times at bat. What is the probability that he gets a hit in his next at bat?
Determine the strength of the causal relationship between monthly sales and new home construction by using correlation.
In a field study of mating behaviour in the Mormon cricket, a biologist noted that some females mated successfully while others were rejected by the males before coupling was complete.
Determine whether or not the average age of the evening students is significantly different from 21. Use a 0.1 level of significance.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
The pooled variance of two samples is:
Sample mean is $43000 for a sample of n = 100 construct a 90% confidence interval that her estimate is correct. Interpret the answer in the context of the problem.
The correlation between the two variables is 0.4. Hourly earnings are regressed on years of education. What is the slope of the OLS regression line?
Does a regression model imply causation? Why or why not? Provide an example which provides and independent and dependent variable from your place of work.
Four movies are randomly selected. Their lenghts were 110, 96, 125, and 136 minutes. Find a 95% confidence interval of the average of the lenghs of the movie.
Their monitoring plan will take a random sample of 5 days sales per month and use the sample mean sales to identify shops that are under-performing. Establish the lower limit sales such that only 5% of the shops would have a sample sales mean belo..
Evaluate 2-month moving average and Exponential smoothing by MAD.
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