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Question 2 (0.5 points) A researcher conducts a study to determine if the mean score for...
Question 3 (0.5 points) A researcher conducts a study to determine if the mean score for...
Question 3 (0.5 points) A researcher conducts a study to determine if the mean score for a sample of n= 30 participants is significantly different from a hypothesized population mean. The mean score for the sample was 9.4 with a standard deviation of 2. The hypothesized population mean is 8. If the researcher conducts a two-tailed test at an a = .05 level of significance, the correct decision is to.... reject the null hypothesis because t calculated is located in...
A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test...
A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = -2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision? Reject the null hypothesis with α = .05 but not with α = .01. Reject the null hypothesis with either α = .05 or α = .01. Fail to reject the null hypothesis with either α = .05 or α = .01....
4) A researcher is testing a hypothesis of a single mean. The critical z value for...
4) A researcher is testing a hypothesis of a single mean. The critical z value for α = .05 and a two tailed test is ±1.96. The observed z value from sample data is minus2.11. The decision made by the researcher based on this information is to _____ the null hypothesis. reject fail to reject redefine change the alternate hypothesis into restate 5) A researcher is testing a hypothesis of a single mean. The critical z value for α =...
A researcher obtains t = 2.25 for a repeated-measures study using a sample of n =...
A researcher obtains t = 2.25 for a repeated-measures study using a sample of n = 10 participants. Based on this t value, what is the correct decision for a two-tailed test? Reject the null hypothesis with a -.05 Reject the null hypothesis with a -01 Fail to reject the null hypothesis with a - .05 Cannot determine without additional information
Question 3 5 pts A researcher selects a sample from a population with a mean of...
Question 3 5 pts A researcher selects a sample from a population with a mean of u= 40 and administers a treatment to the individuals in the sample. If the treatment is expected to decrease scores, which of the following is the correct statement of the null hypothesis for a one-tailed test? The researcher can reject the null hypothesis with a = .05 but not with a = .01. The researcher can reject the null hypothesis with either a =...
Multiple Choice: Question #1 A two tailed hypothesis test is being used to evaluate a treatment...
Multiple Choice: Question #1 A two tailed hypothesis test is being used to evaluate a treatment effect with ( a = .05). if the sample data produce a Z-score of ( z= -2.24), what is the correct decision? A. Reject the null hypothesis and conclude that the treatment has no effect B. Reject the null hypothesis and conclude that the treatment has an effect C. Fail to reject the null Hypothesis and conclude that the treatment has no effect D....
A researcher in interested in whether students who are musicians have higher intelligence test sc...
A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population. The mean for the general population is 100. The researcher selects musicians from local high schools and gives them an intelligence test, with a mean of 105. SS 725 for the 2. 30 sample Null Hypothesis (Ho): μ State in words: Alternative Hypothesis (Ha): μ > State in words: df= t critical value (with α : .05): One-tailed or...
A researcher conducts an experiment consisting of two groups—Group 1, non-smokers, and Group 2, ex-smokers. Group...
A researcher conducts an experiment consisting of two groups—Group 1, non-smokers, and Group 2, ex-smokers. Group 1 consists of 10 participants, while Group 2 has 12 participants. If the researcher conducts a two-tailed two-independent sample t-test, what will the degrees of freedom and the critical values at a 0.05 level of significance be? (Round your critical values to three decimal places.) degrees of freedom critical value (smaller value) critical value (larger value)
A sample of 36 observations is selected from a normalpopulation. The sample mean is 49,...
A sample of 36 observations is selected from a normal population. The sample mean is 49, and the population standard deviation is 5. Conduct the following test of hypothesis using the 0.05 significance level.H0: μ = 50H1: μ ≠ 50Is this a one- or two-tailed test?One-tailed testTwo-tailed test doneWhat is the decision rule?Reject H0 if −1.96 < z < 1.96Reject H0 if z < −1.96 orz > 1.96 doneWhat is the value of the test statistic? (Negative amount should be...
A researcher wants to determine whether high school students who attend an SAT preparation course score...
A researcher wants to determine whether high school students who attend an SAT preparation course score significantly different on the SAT than students who do not attend the preparation course. For those who do not attend the course, the population mean is 1050 (? = 1050). The 16 students who attend the preparation course average 1150 on the SAT, with a sample standard deviation of 300. On the basis of these data, can the researcher conclude that the preparation course...
Question 3 (0.5 points) A researcher conducts a study to determine if the mean score for a sample of n= 30 participants is significantly different from a hypothesized population mean. The mean score for the sample was 9.4 with a standard deviation of 2. The hypothesized population mean is 8. If the researcher conducts a two-tailed test at an a = .05 level of significance, the correct decision is to.... reject the null hypothesis because t calculated is located in...
A researcher obtains t = 2.25 for a repeated-measures study using a sample of n = 10 participants. Based on this t value, what is the correct decision for a two-tailed test? Reject the null hypothesis with a -.05 Reject the null hypothesis with a -01 Fail to reject the null hypothesis with a - .05 Cannot determine without additional information
Question 3 5 pts A researcher selects a sample from a population with a mean of u= 40 and administers a treatment to the individuals in the sample. If the treatment is expected to decrease scores, which of the following is the correct statement of the null hypothesis for a one-tailed test? The researcher can reject the null hypothesis with a = .05 but not with a = .01. The researcher can reject the null hypothesis with either a =...
A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population. The mean for the general population is 100. The researcher selects musicians from local high schools and gives them an intelligence test, with a mean of 105. SS 725 for the 2. 30 sample Null Hypothesis (Ho): μ State in words: Alternative Hypothesis (Ha): μ > State in words: df= t critical value (with α : .05): One-tailed or...
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