You are taking a class with a large number of students. The professor notes that the midterm exam scores were bell-shaped but doesn't tell you the mean. You take a random sample of 10 students and construct a 95 confidence interval for the mean exam score. Now the professor wants to give everyone 5 extra points on the exam. How will your confidence interval change?
a. The sample mean will increase by 5 points and the margin of error will also.
b. The sample mean will increase by 5 points but the margin of error will stay the same.
c. The sample mean will stay the same but the margin of error will increase by 5 points.
d. Both the sample mean and the margin of error will remain unchanged.
Question 2
Which of the following statements is not true regarding a 95 confidence interval for the mean of a population?
a. In 95 of all samples, the sample mean will fall within 2 standard errors of the true population mean.
b. 95 of the population values will lie within 2 standard errors of the sample mean.
c. In 95 of all samples, the true population mean will be within 2 standard errors of the sample mean.
d. If you add and subtract two standard errors to/from the sample mean, in 95 of all cases you will have captured the true population mean.
(a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest
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