A psychological study reports a result of the study using a t test for independent means as ?t(40) = 6.15, p > .05.? How can these results be interpreted?" more information is needed regarding this result to make an interpretation the null hypothesis should be rejected the null hypothesis should not be rejected the null hypothesis should be rejected but only with an alpha lower than .01
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more information is needed regarding this result to make an interpretation
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the null hypothesis should be rejected
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the null hypothesis should not be rejected
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the null hypothesis should be rejected but only with an alpha lower than .01
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- A study of iron deficiency in infants compared samples of infants following different feeding regimens. Here are the summary results on hemoglobin levels at 12 months of age for two samples of infants Group n x s Breast-fed 23 13.3 1.7 Formula 19 12.4 1.8 Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? a. State the null and alternative b. Give the p-value c. Give a conclusion for the hypothesis test.Using the information provided in the SPSS output. You are asked to make a decision about whether to reject the null hypothesis that the population value of gamma equals 0 (i.e., that there is no ordinary association in the population between frequency of prayer and health). If alpha = 0.05 and you use a non-directional alternative hypothesis, which of the following is true?) A. Since the p-value is larger than alpha, you do not reject the null hypothesis B. Since the p-value is less than alpha, you do not reject the null hypothesis C. Since the p-value is larger than alpha, you reject the null hypothesis. D. Since the p-value is less than alpha, you reject the null hypothesisI bought a new set of headphones, and it failed after two days. The manufacturer claims that this happens only in less than 1 percent of cases. The Bureau of Consumer Affairs decides to investigate my complaint and tests 120 sets of headphones. What should their null hypothesis be if they want to collect evidence against the manufacturer's claim? What form should their p-value have? a. H0: p>= 0.01 with p-value P(k >= c | p = 0.01) b. H0: p<= 0.01 with p-value P(k <= c | p = 0.01) c. None of the other answers is correct. d. H0: p<= 0.01 with p-value P(k >= c | p = 0.01) e. H0: p>= 0.01 with p-value P(k <= c | p = 0.01)
- A sample of n = 30 scores produces a calculated t statistic of t = -2.029. If the researcher is using a one-sample t-test and is testing his hypothesis at the alpha=.05 level, the correct statistical decision is: a. The researcher can reject the null hypothesis whether it was a directional or non-directional hypothesis. b. The researcher can fail to reject the null hypothesis if this was a directional hypothesis but not if it was a non-directional hypothesis. c. It is impossible to make a decision about H0 without more information d. The researcher can fail to reject the null hypothesis whether it was a directional or non-directional hypothesis. e. The researcher can reject the null hypothesis if this was a directional hypothesis but not if it was a non-directional hypothesis.Biologists were studying the proportions of cats that had spotted markings on their fur in two populations of cats, C and F. An independent random sample of cats was taken from each population, and the difference between the sample proportions of cats with the spotted markings (C minus F) was 0.62. Under the assumption that all conditions for inference were met, a hypothesis test was conducted with the alternative hypothesis being that the population proportions are not equal. The p-value of the test was 0.01. Which of the following is the correct interpretation of the p-value? If the proportions of all cats with spotted markings is the same for both populations, the probability of observing a sample difference of at least 0.62 or at most −0.62is 0.01. Answer A: If the proportions of all cats with spotted markings is the same for both populations, the probability of observing a sample difference of at least 0.62 or at most negative 0.62 is 0.01. A If the…A researcher is interested in studying the difference in the average level of anxiety among college students who are in their first semester of college compared to students who are in their final semester of college. The researcher has a sample of 62 students in their first semester and 60 students in their final semester and conducts a two-sample t-test (two-tailed, alpha = .05). The researcher finds the following: 1. Students in their first semester of college (group 1) have an average anxiety score of 1.8. 2. Students in their final semester of college (group 2) have an average anxiety score of 2.8. 3. The standard error of the mean difference between students in their first semester and final semester (i.e., the se) is .20. What are the degrees of freedom for this test? Enter your answer as a whole number with no decimal places (i.e., 10, not 10.1, not 10.10).
- A researcher conducts a two-tailed hypothesis test with an alpha of 0.05 and obtains a z statistic of 2.11. What decision should she make? Question 6 options: accept the null hypothesis fail to reject the null hypothesis fail to reject the research hypothesis reject the null hypothesis Previous PageNext PageA researcher expects a treatment to increase the scores for individuals in a population. The treatment is evaluated using a one-tailed hypothesis test, and the test produces z = +2.40. Based on this result, which is the correct statistical decisionA researcher, working for a large pharmaceutical company, is interested in testing the claim that less than 24% of people who take a new sinus medication receive symptom relief in less than 15 minutes. To test this claim, the researcher collects the following data on a sample of 500 adults and 110 of them receive symptom relief in less than 15 minutes after taking the medication. The following is the data from this study: Sample size =500 adults The alternative hypothesis is Ha:p<0.24 The test statistic is calculated as z0=−1.05. Find and interpret the p− value for this hypothesis test. Use the curve below to help visualize your answer. Select the appropriate test by dragging the blue point to a right-, left- or two-tailed diagram, then set the test statistic on the x-axis to find the p-value. Based on the p-value, choose the correct interpretation. Move the blue dot to choose the appropriate test
- A researcher who wants to know whether the proportion of male births in a hospital is different from the established baseline of 51.07%, would like to test the following hypotheses: Ho:P = 0.51 vs. Ha :P = does not equal 0.51 a) Is the alternative hypothesis upper tail, lower tail, or two tailed? b) What do you conclude if the test results p-value of 0.03 at alpha value = 5% c) What do you conclude if the test results p-value of 0.08 at alpha value = 10%A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores. The hypothesis test produces a z-score of z = 2.27. If the researcher is using a one-tailed test, what is the correct statistical decision?An Internet provider is trying to gain advertising deals and claims that the mean time the competitors' customers spend online per day is less than 33 minutes. You are asked to test this claim. (a) How would you write the null and alternative hypotheses if you represent the Internet provider and want to support the claim? (b) How would you write the null and alternative hypotheses if you represent a competing advertiser and want to reject the claim? (a) H0: ▼ pp muμ sigmaσ sigma squaredσ2 ▼ less than< greater than> less than or equals≤ greater than or equals≥ not equals≠ 33 Ha: ▼ sigma squaredσ2 muμ pp sigmaσ ▼ less than or equals≤ not equals≠ greater than> greater than or equals≥ less than< 33 (b) H0: ▼ muμ sigma squaredσ2 pp sigmaσ ▼ less than< greater than or equals≥ not equals≠ greater than> less than or equals≤ 33 Ha: ▼ muμ sigma squaredσ2…