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Testing Claims About Proportions. In Exercises 9鈥32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the normal distribution as an approximation to the binomial distribution, as described in Part 1 of this section.

Eliquis The drug Eliquis (apixaban) is used to help prevent blood clots in certain patients. In clinical trials, among 5924 patients treated with Eliquis, 153 developed the adverse reaction of nausea (based on data from Bristol-Myers Squibb Co.). Use a 0.05 significance level to test the claim that 3% of Eliquis users develop nausea. Does nausea appear to be a problematic adverse reaction?

Short Answer

Expert verified

Nullhypothesis: The proportion of patients who suffered from the adverse reaction is equal to 3%.

Alternativehypothesis: The proportion of patients who suffered from the adverse reaction is not equal to 3%.

Teststatistic: -1.895

Criticalvalue: 1.96

P-value: 0.0581

The null hypothesis is failed to reject.

There is not enough evidence to reject the claim that the proportion of patients who developed an adverse reaction is equal to 0.03.

Nausea does not appear to be a serious problem as the percentage of subjects who developed nausea is less than 3%.

Step by step solution

01

Given information

Among 5,924 patients treated with Eliquis, 153 developed the adverse reaction of nausea.

02

Hypotheses

The null hypothesis is written as follows:

The proportion of patients who suffered from the adverse reaction is equal to 3%.

H0:p=0.03

The alternative hypothesis is written as follows:

The proportion of patients who suffered from the adverse reaction is not equal to 3%.

H1:p0.03

The test is two-tailed.

03

Sample size, sample proportion, and population proportion

The sample proportion of patients who suffered from the adverse reaction is as follows:

p^=NumberofpatientswhodevelopedadversereactionTotalnumberofpatients=1535924=0.0258

The population proportion of patients who developed an adverse reaction is equal to p=0.03.

The sample size (n) is equal to 5924.

04

Test statistic

The value of the test statistic is computed below:

z=p^-ppqn=0.0258-0.030.031-0.035924=-1.895

Thus, z=-1.895.

05

Critical value and p-value

Referring to the standard normal distribution table, the critical value of z at =0.05for a two-tailed test is equal to 1.96.

Referring to the standard normal distribution table, the p-value for the two-tailed test using absolute test statistic (1.895) is equal to 0.0581.

Since the p-value is greater than 0.05, the null hypothesis is failed to reject.

06

Conclusion of the test

There is not enough evidence to reject the claim that the proportion of patients who developed an adverse reaction is equal to 0.03.

Only 2.6% of the subjects developed nausea as an adverse reaction of even less than 3%. Thus, it can be said that nausea does not appear to be a serious problem.

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Most popular questions from this chapter

t Test Exercise 2 refers to a t test. What is the t test? Why is the letter t used? What is unrealistic about the z test methods in Part 2 of this section?

Testing Claims About Proportions. In Exercises 9鈥32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the normal distribution as an approximation to the binomial distribution, as described in Part 1 of this section.

Postponing Death An interesting and popular hypothesis is that individuals can temporarily postpone death to survive a major holiday or important event such as a birthday. In a study, it was found that there were 6062 deaths in the week before Thanksgiving, and 5938 deaths the week after Thanksgiving (based on data from 鈥淗olidays, Birthdays, and Postponement of Cancer Death,鈥 by Young and Hade, Journal of the American Medical Association, Vol. 292, No. 24). If people can postpone death until after Thanksgiving, then the proportion of deaths in the week before should be less than 0.5. Use a 0.05 significance level to test the claim that the proportion of deaths in the week before Thanksgiving is less than 0.5. Based on the result, does there appear to be any indication that people can temporarily postpone death to survive the Thanksgiving holiday?

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Heights of Supermodels Listed below are the heights (cm) for the simple random sample of female supermodels Lima, Bundchen, Ambrosio, Ebanks, Iman, Rubik, Kurkova, Kerr,Kroes, Swanepoel, Prinsloo, Hosk, Kloss, Robinson, Heatherton, and Refaeli. Use a 0.01 significance level to test the claim that supermodels have heights with a mean that is greater than the mean height of 162 cm for women in the general population. Given that there are only 16 heights represented, can we really conclude that supermodels are taller than the typical woman?

178 177 176 174 175 178 175 178 178 177 180 176 180 178 180 176

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

Testing Claims About Proportions. In Exercises 9鈥32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the normal distribution as an approximation to the binomial distribution, as described in Part 1 of this section.

Touch Therapy Repeat the preceding exercise using a 0.01 significance level. Does the conclusion change?

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