1. To test the hypothesis Ho: µ 220 versus Ha: µ < 200, a z-score of 3.87 is fou
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Question
1. To test the hypothesis Ho: µ 220 versus Ha: µ < 200, a z-score of 3.87 is found. The probability of observing a z-score of 3.87 or one that is even larger, assuming the true mean is really greater or equal to 220, is called _____. a. the z-statistic b. a random sample c. the p-value d. the test statistic
2. The animal’s tidal volume is known to be normally distributed with a mean of 45 cc and a standard deviation of 5 cc. A research team believes that the mean is actually larger than previously thought. They collected a random sample of 20 experimental animals and found a sample mean tidal volume of 46.5 cc. State the hypotheses
a. Ho: x 46.5 cc versus Ha: x > 46.5 cc
b. Ho: µ 45 cc versus Ha: µ > 45 cc
c. Ho: µ 46.5 cc versus Ha: µ > 46.5 cc
d. Ho: µ 45 cc versus Ha: µ < 45 cc
Explanation / Answer
1. c. the p-value
2.
b. Ho: µ 45 cc versus Ha: µ > 45 cc
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