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Robins are common birds in North America. Suppose that the wingspan of robins is approximately normal with mean 14 inches and standard deviation 0.7 inches.
What proportion of robins have wingspans longer 15.5 inches?
raisel is the new statistician at a cola company. she wants to estimate the proportion of the population who enjoy
Determine the test statistic. At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
From an inventory of 48 cars being shipped to local automobile makers, 12 have defective radios installed. What is the probability that one particular dealership receiving 8 cars will find 2 radios being defective? Make assumptions if necessary.
your company produces two products model alpha and model beta. these products have profits or contributions of 120 and
Does the plot show a positive association, a negative association, or no association between the two variables? Explain.
Does this apparent underrepresentation of Hispanics call into question the fairness of the jury selection system? Explain.
a hockey team has 6 forwards 4 defensemen and 2 goalies. at any time 3 forwards 2 defensemen and 1 goalie can be on the
Customers who enter the store, and ask them if they have a Ralph's card. Suppose they solicit 400 customers one day, and find that 160 of them have a Ralph's card.
A formula in financial analysis is: Return on equity = net profit margin * total asset turnover * equity multiplier. Suppose that the equity multiplier is fixed at 4.0, but that the net profit margin is normally distributed with a mean of 3.8%.
To study the relationship between age and opinion about whether marijuana should be legal.- For each of parts (a) and (b) of this exercise, state the explanatory variable and the response variable.
As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
Give a 95% confidence interval for the difference in bleeding times. Do you think pressure increases mean bleeding time? Why?
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