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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

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

The Ericsson method is one of several methods claimed to increase the likelihood of a baby girl. In a clinical trial, results could be analysed with a formal hypothesis test with the alternative hypothesis of p>0.5, which corresponds to the claim that the method increases the likelihood of having a girl, so that the proportion of girls is greater than 0.5. If you have an interest in establishing the success of the method, which of the following P-values would you prefer: 0.999, 0.5, 0.95, 0.05, 0.01, and 0.001? Why?

We have been provided a scenario for a hypothesis test for a population mean. Decide whether the z-test is an appropriate method for conducting the hypothesis test. Assume that the population standard deviation is known in the given case.

Preliminary data analyses reveal that the sample data contain no outliers but that the distribution of the variable under consideration is probably highly skewed. The sample size is 24.

Test Statistics. In Exercises 13鈥16, refer to the exercise identified and find the value of the test statistic. (Refer to Table 8-2 on page 362 to select the correct expression for evaluating the test statistic.)

16. Exercise 8 鈥淧ulse Rates鈥

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 5 鈥淥nline Data鈥

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