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The paper "Answer Changing on Multiple-Choice Tests" (Journal of Experimental Education [1980]: 18-21) reported that for a group of 162 college students, the average number of responses changed from the correct answer to an incorrect answer on a test containing 80 multiplechoice items was 1.4. The corresponding standard deviation was reported to be 1.5. Based on this mean and standard deviation, what can you tell about the shape of the distribution of the variable number of answers changed from right to wrong? What can you say about the number of students who changed at least six answers from correct to incorrect?
Compute the correlation coefficient for the data. (Round your answer to 4 decimal places, the tolerance is +/-0.0001.) What is your interpretation of this value?
Interpret the slope.
during the past three weeks sales of a brand of medicine have been as followsweeksales171270369using exponential
Construct the following confidence intervals for your data set:
If you plan to reject the first card offered, and to then accept the second card if and only if its value is greater than the value of the first card, what is the probability that you will accept the highest valued card?
You are asked to conduct a study to determine if gender has any bearing on the choice of a dog or cat as a pet. You take a random sample of 350 adults and ask each what kind of pet they would prefer, a dog or a cat?
the average salary of a male full professor at a public four-year institution offering classes at the doctoral level is
Determine the conditional distribution of the number of registered signals given the number of transmitted signals, that is, compute P (Y (t) = k | X(t) = n) for suitable choices of k and n.
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
incomes in a certain town are strongly-right skewed with mean 36000 and standard deviation 7000. a random sample of 10
Under the assumption that co payment amounts are normally distributed, find a 99% confidence interval for the mean amount in dollars.
let x have the probability density functionfx2x 0 lt x lt 1 and 0 otherwisecompute the probability that x is at least
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