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Chapter 8: Q12 (page 372)

In Exercises 9鈥�12, refer to the exercise identified. Make subjective estimates to decide whether results are significantly low or significantly high, then state a conclusion about the original claim. For example, if the claim is that a coin favours heads and sample results consist of 11 heads in 20 flips, conclude that there is not sufficient evidence to support the claim that the coin favours heads (because it is easy to get 11 heads in 20 flips by chance with a fair coin).

Exercise 8 鈥淧ulse Rates鈥�

Short Answer

Expert verified

The result of 11.3 bpm isneither significantly low nor significantly high.

There is enough evidence to reject the claim that the standard deviation of pulse rates of adult males is more than 11 bpm.

Step by step solution

01

Given information

Refer to Exercise 8 BSC; for a sample of 153 adult males, the mean pulse rate is equal to 69.6 bpm, and the standard deviation is equal to 11.3 bpm.

02

Conclusion

It is claimed that the standard deviation of the pulse rate of adult males is more than 11 bpm.

That is, 蟽>11bpm

Since the value of 11.3 bpm is not considerably greater than the claimed value of 11 bpm, it appears to be likely to obtain a standard deviation of 11.3 bpm in a sample when the true standard deviation of pulse rates is 11 bpm.

Therefore, the result of 11.3 bpm is neither significantly low nor significantly high.

Thus, this suggests that there is enough evidence to reject the claim that the standard deviation of pulse rates of adult males is more than 11 bpm.

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Most popular questions from this chapter

Testing Hypotheses. In Exercises 13鈥�24, assume that a simple random sample has been selected and test the given claim. Unless specified by your instructor, use either the P-value method or the critical value method for testing hypotheses. Identify the null and alternative hypotheses, test statistic, P-value (or range of P-values), or critical value(s), and state the final conclusion that addresses the original claim.

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Final Conclusions. In Exercises 25鈥�28, use a significance level of 伪 = 0.05 and use the given information for the following:

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Original claim: The standard deviation of pulse rates of adult males is more than 11 bpm. The hypothesis test results in a P-value of 0.3045.
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