It is easier to reject the null hypothesis if the researcher uses a smaller alpha (α) level. choose True or False?
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It is easier to reject the null hypothesis if the researcher uses a smaller alpha (α) level. choose True or False?
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- "You run a regression with 9 variables on Y with 40 observations. A t-stat of one of the variables come up as 2.115 for a null hypothesis. At the 95% confidence level, you would" A reject the null hypothesis in favor of the alternative since t is greater than the critical value. B reject the null hypothesis in favor of the alternative since t is less than the critical value. fail to reject the null hypothesis since t is less than the critical value. D fail to reject the null hypothesis since t is greater than the critical value.HR department wants to make sure that their hiring practices are independent of gender. In other words, they want to ensure that both men and women have an equal chance of being hired. The observed data related to this survey is summarized in the following table: Observed frequency Male Female Total Hired 45 35 Not Hired 32 28 Total Given Ho = “HR department hired male and female employees equally”, decide whether to reject or fail to reject the null hypothesis (α = 0.05).Which of following is not true about Type I error? The alpha (x) level False positive Rejecting the null hypothesis when in reality it is true. Accepting (not rejecting) the null hypothesis when in reality it is false.
- The records of a casualty insurance company show that, in the past, it’s clients have had a mean of 1.8 auto accidents per day with a variance of 0.0036. The actuaries of the company claim that the variance of the number of accidents per day is no longer equal to 0.0036. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries claim. State the null hypothesis H0 and the alternative hypothesis H1 that we would use for this test.The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.7 auto accidents per day with a variance of 0.0025. The actuaries of the company claim that the variance of the number of accidents per day is no longer equal to 0.0025. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries' claim. State the null hypothesis Ho and H1 the alternative hypothesis that we would use for this test. Ho:? H1:?A researcher wants to know if male and female college students differ with regard to their GPAs. She randomly gets 16 male and 16 female college students to report their GPAs. The males reported a mean GPA of 3.05 with a SS = 3.75. The females reported a mean GPA of 3.1 with a SS = 2.4. You are going to be conducting an independent samples t-test. You will be conducting a two-tailed test with alpha α=.05. What is the critical t-value(s) for this test?
- A researcher wants to compare the effectiveness of two treatments on a sample of 25 patients. What is the null hypothesis for the Wilcoxon Signed-Ranks Test?A company has just developed a new antibiotic. 2 percent of children taking competing antibiotics experience a headache as a side effect. A researcher believes that the proportion of children taking the new antibiotic who experience a headache as a side effect is more than 0.02. We know that the null hypothesis is H0 : p = 0.02 and the alternative hypothesis is H1 : p > 0.02. Suppose that the sample evidence indicates thata. the null hypothesis is rejected. State the conclusion.b. the null hypothesis is not rejected. State the conclusion.Help!!
- The records of a casualty insurance company show that, in the past, it’s clients have had a mean of 1.8 auto accidents per day with a variance of 0.0025. The actuaries of the company claim that the variance of the number of accidents per day is no longer equal to 0.0025. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries claim. State the null hypothesis H0 and the alternative hypothesis H1 that we would use for this test.Explain why a level of significance of α = 0 is not used. Why is a level of significance of α = 0 not used? A. If x = 0, the alternative hypothesis cannot be rejected, making the hypothesis test useless. B. If α = 0, the alternative hypothesis is always rejected, making the hypothesis test useless. C. If α = 0, the null hypothesis cannot be rejected, making the hypothesis test useless. D. If x=0, the null hypothesis is always rejected, making the hypothesis test useless.TRUE OR FALSE If a test value is in the critical region with a=0.01, it would still be in the critical region even if the alpha was changed to =0.05. If a researcher obtains a test score of z=1.7 for a hypothesis test using =0.05, then the researcher should reject the null hypothesis for a right-tailed test. In addition, the researcher should also reject the null hypothesis for a two-tailed test. The z test formula uses the sample standard deviation while the t test formula uses the population standard deviation. The critical t value(s) depends on the degrees of freedom associated with the t test value. A type I error occurs when a researcher unknowingly obtains an extreme non-representative example. The null hypothesis should be rejected if the test value is -2.8, =0.01, and the test is left-tailed. The variance of the standard normal distribution and the t-distribution is 1.