A 95% confidence interval for a population mean is (28, 38). Can you reject the null...
A 95% confidence interval for a population mean is (28, 38). Can you reject the null hypothesis that μ = 24 at the 5% significance level? (Possible answers: Yes, No, Unable to determine).
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A 95% confidence interval for a population mean is (28, 38). Can
you reject the null...
A 95% confidence interval for a population mean was calculated. The sample mean was found to...
A 95% confidence interval for a population mean was calculated. The sample mean was found to be 34.5 and the MOE was found to be 4.06 giving us a confidence interval of 34.5±4.06 or equivalently written as 30.44 to 38.56. (a) For the hypotheses H0:?=30 Ha:??30, would you reject the null hypothesis at the 5% level of significance (i.e. ? = 0.5)? (Type: YES or NO or CANNOT TELL): (b) For the hypotheses H0:?=41 Ha:??41, would you reject the null...
1. You want to test whether you can reject the null hypothesis that a population mean...
1. You want to test whether you can reject the null hypothesis that a population mean is greater than or equal to 10. To do this, you collect a random sample of size 500 from the population, and you calculate that the sample mean and sample standard deviation are 8.6 and s, respectively. Which of the following is true? a. If s is any value between 11 and 13, you can reject the null hypothesis at the 5% significance level....
A random sample is drawn from a distribution and the resulting population mean confidence interval for...
A random sample is drawn from a distribution and the resulting population mean confidence interval for 90% confidence level is (32.5, 38.1). The null hypothesis for the population mean is H0: μ = 33.3. Should it be accepted at 5% significance level? Justify your answer.
4. Suppose you would like to construct a confidence interval for the population mean of a...
4. Suppose you would like to construct a confidence interval for the population mean of a particular variable. With that in mind, you take a random sample from the population, and obtain the values shown below. a. Please construct a 84% confidence interval for the population mean using your sample of data. b. Your friend claims that the population mean equals 92. With your sample of data, please use the t-stat method to test this hypothesis using a significance level...
19. The 99% confidence interval is _________ than 95% confidence interval in a same problem. a....
19. The 99% confidence interval is _________ than 95% confidence interval in a same problem. a. smaller b. larger 20. Suppose 95% confidence interval of the population mean is (4.5, 9.7). (20.a) The population mean must be in the range (4.5, 9.7). a. True b. False (20.b) What is the chance of error if you say that the population mean is somewhere in the range (4.5, 9.7) a. 0.95 b. 0.05 c. 0 d. 0.5 (20.c) How sure is it...
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher...
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher (who does not know that p Then she constructs a 95% confidence interval of the population mean. 22) selects a random sample of size n from this population. The true population mean and the researcher's 95% confidence interval of the population mean are shown in the following graph. Use the graph to answer the questions that follow Sample Mean 95% Confidence interval of the...
You are only willing to reject the null hypothesis if you achieve 95% confidence or better....
You are only willing to reject the null hypothesis if you achieve 95% confidence or better. Consider the following information: Họ : 4 = 10 t = 2.102 n=1001 Select the appropriate conclusion below. Hint: you'll need to find the critical value for t using a t-table Do not reject the Null Hypothesis Reject the Null Hypothesis You are only willing to reject the null hypothesis if you achieve 95% confidence or better. Consider the following information: H : 7...
Based on a sample of data, a researcher forms a confidence interval for the population mean...
Based on a sample of data, a researcher forms a confidence interval for the population mean mu that extends from 2.5 to 7.3 at the 95% confidence level. She then wishes to test Ho: mu = 3 against Ha: mu3 at the .05 level of significance. What can she conclude based on this confidence interval? confidence must be at the 90% level O retain Ho O the data must be false O reject Ho
N = 28 Mean = 143.00 StDev = 21.00 SE Mean = 3.97 95% Upper Bound = 149.76 T...
N = 28 Mean = 143.00 StDev = 21.00 SE Mean = 3.97 95% Upper Bound = 149.76 T = -1.76 P = 0.045 What conclusion could be drawn at the level of significance α = .05? a. Accept the null hypothesis because the P-value is less than the level of significance. b. Fail to reject the null hypothesis because the P-value is less than the level of significance. c. Reject the null hypothesis because the P-value is less than the level of...
Suppose that based on two independent samples, the 95% confidence interval for the difference between two...
Suppose that based on two independent samples, the 95% confidence interval for the difference between two population proportions, p1−p2 is (-0.29, -0.01). If a test of hypotheses H0: p1−p2 = 0 versus Ha: p1−p2 ≠ 0 was conducted at 0.05 level of significance based on these samples, the decision would be to .. retain the null hypothesis? reject the null hypothesis?
10. Properties of a confidence interval Suppose the mean of a population is 22. A researcher (who does not know that p Then she constructs a 95% confidence interval of the population mean. 22) selects a random sample of size n from this population. The true population mean and the researcher's 95% confidence interval of the population mean are shown in the following graph. Use the graph to answer the questions that follow Sample Mean 95% Confidence interval of the...
You are only willing to reject the null hypothesis if you achieve 95% confidence or better. Consider the following information: Họ : 4 = 10 t = 2.102 n=1001 Select the appropriate conclusion below. Hint: you'll need to find the critical value for t using a t-table Do not reject the Null Hypothesis Reject the Null Hypothesis You are only willing to reject the null hypothesis if you achieve 95% confidence or better. Consider the following information: H : 7...
Based on a sample of data, a researcher forms a confidence interval for the population mean mu that extends from 2.5 to 7.3 at the 95% confidence level. She then wishes to test Ho: mu = 3 against Ha: mu3 at the .05 level of significance. What can she conclude based on this confidence interval? confidence must be at the 90% level O retain Ho O the data must be false O reject Ho
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