The time it takes Jessica to bicycle to school is normally distributed with mean 15 minutes and variance 4 . Jessica has to be at school at 8:00 am. Suppose you saw her at class, and she said it took her 23 minutes to get to school that day. Which of the following is a reasonable inference or conclusion?
a. Twenty-three minutes to school is not an unusually long commute time.
b. A commuting time of 23 minutes is highly unusual or atypical.
c. The distribution of commute times must not be normal with mean 15 minutes and standard deviation 2 minutes.
d. Both A commuting time of 23 minutes is highly unusual or atypical and The distribution of commute times must not be normal with mean 15 minutes and standard deviation 2 minutes are feasible conclusions.
e. Both Twenty-three minutes to school is not an unusually long commute time and The distribution of commute times must not be normal with mean 15 minutes and standard deviation 2 minutes are feasible conclusions.
Question 2
For a given data set and confidence level, the confidence interval of the population proportion p will be wider for 95 confidence than for 90 confidence.
Indicate whether the statement is true or false
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