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To estimate the difficulty of the final exam, the teaching team has designed a mock exam that is at the same level of difficulty as that of the real exam. If the average mark for this mock exam is lower than 60, that would indicate that the level of difficulty is too challenging for all students. In order to find out the difficulty level of the mock exam, the teaching team randomly invited a sample of 20 students to take the mock exam. The average mark of the sample is 66, with a sample standard deviation of 10. Supposing that the score is normally distributed, what hypothesis (or hypotheses) should the teaching team raise if they want to make sure that the level of difficulty for the exam is not too challenging.
GPA and IQ. Do you believe that the grade point average of a college student is correlated with the student's intelligence quotient (IQ)?
Does the sample data suggest a decline in spending on movie concessions at the significance level of a = 0.05?
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Construct a 95% confidence interval for the true proportion of the market who still refuse to visit any of the restaurants in the chain three months after the event.
Two basketball players on a school tea m are working hard on consistency of their performance . In particular, they are hoping to bring down the variance.
At a car rental agency, 0.34 of the cars are returned on time. A sample of 11 car rentals is studied. What is the probability that more than 3 of them are retur
The government of a particular country reports its literacy rate as 52%. A nongovernmental organization believes it to be less.
At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make? Please provide step by step solution.
Suppose that the loan amount on mortgages for a particular zip code is normally distributed with a mean of 154,449, measured in dollars
if other factors are held constant if the pearsons correlation between x and y is r 0.80 then the regression equation
According to a police source, a car with a certain protection system will be recovered 89% of the time.
Research its rivals in the global marketplace and market conditions in the overseas market you are targeting. Justify your recommended entry strategy based on these industry and market conditions.
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