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A sample mean with a z-score greater than or equal to the critical value of 1.645 is significant at the 0.05 level. There is 0.05 to the right of the critical value. DECISION: The sample mean has a z-score greater than or equal to the critical value of 1.645. Thus, it is significant at the 0.05 level.
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A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches....
A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches....
A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.80, a random sample of 100 doctors results in 75 who indicate that they recommend aspirin. Test the null hypothesis that at least 80% of doctors recommend aspirin for headaches. Use a 05 Use the critical value method. What is the correct level of significance...
A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches....
A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.80, a random sample of 100 doctors results in 75 who indicate that they recommend aspirin. Test the null hypothesis that at least 80% of doctors recommend aspirin for headaches. Use =:05 Use the critical value method. Which of the following is the correct hypothesis...
A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches....
A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim, a random sample of 100 doctors is obtained. Of these 100 doctors, 81 indicate that they recommend aspirin. Is this claim accurate? Use alpha = 0.05 (a) What is the value of the sample proportion ? (b) what is the value from the z-test?
Ha: P recommand L,90 4. A survey claims that 9 out of 10 doctors recommend aspirin...
Ha: P recommand L,90 4. A survey claims that 9 out of 10 doctors recommend aspirin for their patients with bad headaches. To test this claim against the alternative that the population proportion of doctors who recommend aspirin is less than 0.90. A random sample of 100 doctors was selected. Suppose you reject the null hypothesis with alpha = 0.01. (à. there is insufficient evidence to conclude that the proportion of doctors who recommend aspirin is 0.90 or more. b,...
Question 14 1 pts A survey claims that 9 out of 10 doctors (i.e., 90%) recommend...
Question 14 1 pts A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z- -2.23. Can we conclude that the null hypothesis should be rejected at the a) a =0.10, b) a = 0.05, and c)...
Question 14 1 pts A survey claims that 9 out of 10 doctors (ie. 90%) recommend...
Question 14 1 pts A survey claims that 9 out of 10 doctors (ie. 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statisticis z --2.23. Can we conclude that the null hypothesis should be rejected at the a) a =0.10, b) a = 0.05, and c) a...
help me 10 COLUOPULU PL . 5. In a survey, 8236 out of 9858 doctors recommend...
help me
10 COLUOPULU PL . 5. In a survey, 8236 out of 9858 doctors recommend aspirin for for their patients with headaches. Let p denote the percentage of doctors who would recommend aspirin for their patients with headache. (a) Construct a 95% confidence interval for p based on the sample information (b) It has been claimed that 9 out of 10 doctors recommend aspirin for their patients with headaches. Is this claim accurate? Perform a statistical test at the...
Problem 1. The p-value for testing is 0.043 a) What decision is made using 0.05 significance...
Problem 1. The p-value for testing is 0.043 a) What decision is made using 0.05 significance level? b) Say you increase the significance level to 10. Would your decision change? Explain c) Say you decrease the significance level to .01. Would your decision change? Explain Problem 2. Assuming an equal chance of a new baby being a boy or a girl, what is the probability that more than 60 out of the next 100 births at a local hospital will...
3) 3) A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand...
3) 3) A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their patients. To test this claim against the alternative that the actual proportion is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z .-2.23. Can we conclude that Ho should be rejected at the a) a = .10, b) a = .05, and c) a - .01 level? A) a) yes; b) yes;...
In a study of treatments for very painful "cluster" headaches, 153 patients were treated with oxygen...
In a study of treatments for very painful "cluster" headaches, 153 patients were treated with oxygen and 157 other patients were given a placebo consisting of ordinary air. Among the 153 patients in the oxygen treatment group, 110 were free from headaches 15 minutes after treatment. Among the 157 patients given the placebo, 23 were free from headaches 15 minutes after treatment. Use a 0.05 significance level to test the claim that the oxygen treatment is effective. Complete parts (a)...
A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.80, a random sample of 100 doctors results in 75 who indicate that they recommend aspirin. Test the null hypothesis that at least 80% of doctors recommend aspirin for headaches. Use a 05 Use the critical value method. What is the correct level of significance...
A survey claims that 8 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.80, a random sample of 100 doctors results in 75 who indicate that they recommend aspirin. Test the null hypothesis that at least 80% of doctors recommend aspirin for headaches. Use =:05 Use the critical value method. Which of the following is the correct hypothesis...
Ha: P recommand L,90 4. A survey claims that 9 out of 10 doctors recommend aspirin for their patients with bad headaches. To test this claim against the alternative that the population proportion of doctors who recommend aspirin is less than 0.90. A random sample of 100 doctors was selected. Suppose you reject the null hypothesis with alpha = 0.01. (à. there is insufficient evidence to conclude that the proportion of doctors who recommend aspirin is 0.90 or more. b,...
Question 14 1 pts A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z- -2.23. Can we conclude that the null hypothesis should be rejected at the a) a =0.10, b) a = 0.05, and c)...
Question 14 1 pts A survey claims that 9 out of 10 doctors (ie. 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statisticis z --2.23. Can we conclude that the null hypothesis should be rejected at the a) a =0.10, b) a = 0.05, and c) a...
help me
10 COLUOPULU PL . 5. In a survey, 8236 out of 9858 doctors recommend aspirin for for their patients with headaches. Let p denote the percentage of doctors who would recommend aspirin for their patients with headache. (a) Construct a 95% confidence interval for p based on the sample information (b) It has been claimed that 9 out of 10 doctors recommend aspirin for their patients with headaches. Is this claim accurate? Perform a statistical test at the...
Problem 1. The p-value for testing is 0.043 a) What decision is made using 0.05 significance level? b) Say you increase the significance level to 10. Would your decision change? Explain c) Say you decrease the significance level to .01. Would your decision change? Explain Problem 2. Assuming an equal chance of a new baby being a boy or a girl, what is the probability that more than 60 out of the next 100 births at a local hospital will...
3) 3) A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their patients. To test this claim against the alternative that the actual proportion is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z .-2.23. Can we conclude that Ho should be rejected at the a) a = .10, b) a = .05, and c) a - .01 level? A) a) yes; b) yes;...
In a study of treatments for very painful "cluster" headaches, 153 patients were treated with oxygen and 157 other patients were given a placebo consisting of ordinary air. Among the 153 patients in the oxygen treatment group, 110 were free from headaches 15 minutes after treatment. Among the 157 patients given the placebo, 23 were free from headaches 15 minutes after treatment. Use a 0.05 significance level to test the claim that the oxygen treatment is effective. Complete parts (a)...
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