Question

1. 9-10) A manufacturer of cheese filled ravioli supplies a pizza restaurant chain. Based on data collected

from its automatic filling process, the amount of cheese inserted into the ravioli is normally distributed. To make sure that the automatic filling process is on target, quality control inspectors take a sample of 25 ravioli and measure the weight of cheese filling. They find the 99% confidence interval of 14.16 to 15.84 grams. Which of the following is the correct interpretation?

1. We are 99% confident that the mean weight of cheese filling in all ravioli made by this process is between 14.16 and 15.84 grams.
2. 99% of all ravioli made by this process will have cheese filling weights between 14.16 and 15.84 grams.
3. We are 99% confident that the interval (14.16, 15.84) contains the mean weight of cheese filling in all ravioli made by this process.
4. The weight of cheese filling in the ravioli is between 14.16 and 15.84 grams 99% of the time.

1. 1. Ionly
   2. IIIonly
   3. I and III.
   4. II and III
   5. I and IV
2. Absorption rates into the body are important considerations when manufacturing a generic version of a brand-name drug. A pharmacist read that the absorption rate into the body of a new generic drug (G) is the same as its brand name counterpart (B). She has a researcher friend of hers run a small experiment to test H₀: the absorption rates are the same between brand (A) and brand (B), Ha: the absorption rate for brand (A) is different from that for brand (B). Which of the following is a type I error?

1. The researcher cannot make a Type I error since he has run an experiment.
2. Conclude that the absorption rates for brand (A) and brand (B) are different, but in fact they are the same.
3. Conclude that the absorption rates are the same for these two brands, but in fact they are different.
4. Conclude that the absorption rates for brand (A) and brand (B) are different, and in fact they are.
5. Conclude that the absorption rates are the same for these two brands, and in fact they are.

3. A sample of 30-year fixed mortgage rates at 12 randomly chosen credit unions yields a mean rate of 6.65% and a sample standard deviation of 0.39%. A sample of 30 year fixed mortgage rates at 16 randomly selected banks yields a mean rate of 7.05% and a sample standard deviation of 0.22%. We are curious about whether the mean rates are different between credit unions and banks? Which of the following is true?

1. This is a paired design.

II. This is a test of two means from independent groups.

III. This is also a two-sided test.

    IV.This is also a one-sided test

1. I only     B) II only      C) Both II and IV     D) Both II and III         E) Both I and III

Answer 1

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