3.3. In the sampling distribution of the sample means, the standard error of the mean will vary according to the size of the sample. As the sample size, n, gets larger, the variability of the sampling distribution gets larger. (Points : 3) True False Question 7.7. In research, random sampling is necessary to avoid any form of error. (Points : 3) True False Question 8.8. A collection of items, measurements, or entities taken from a population in such a manner as to ensure each has the same chance of being included is a simple random sample. (Points : 3) True False Question 9.9. Simple random sampling is the only method to ensure a representative sample can the selected. (Points : 3) True False Question 10.10. Type I Error occurs when the null hypothesis is true but is rejected. (Points : 3) True False Question 11.11. When a decision is made to retain a false null hypothesis, a Type II Error occurs. (Points : 3) True False Question 12.12. When selecting an alpha level to conduct a hypothesis test, the researcher is determining the probability of making a Type I Error. (Points : 3) True False Question 23.23. If the coefficient of correlation is 0.80, the coefficient of determination is 0.64. (Points : 3) True False Question 25.25. For an inverse relationship between two variables, the sign of the correlation coefficient is "+". (Points : 3) True False Question 17.17. For a one-tailed hypothesis test, the critical z value of the test statistic is -2.33. Which of the following is true about the hypothesis test? (Points : 3) a = 0.05 for a lower-tailed test a = 0.01 for an upper-tailed test a = 0.05 for an upper-tailed test a = 0.01 for a lower-tailed test Question 20.20. A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the decision for a statistical significant change in average weights at birth at the 5% level of significance? (Points : 3) Reject the null hypothesis and conclude the mean is higher than 6.6 pounds. Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Fail to reject the null hypothesis. Cannot calculate because the population standard deviation is unknown. Question 21.21. The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. Does the sample data show a significant increase in the average birthrate at a 5% level of significance? (Points 3) Fail to reject the null hypothesis and conclude the mean is 6.6 pounds. Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Cannot calculate because the population standard deviation is unknown. Reject the null hypothesis and conclude the mean is greater than 6.6 pounds. : Question 3.3. In the sampling distribution of the sample means, the standard error of the mean will vary according to the size of the sample. As the sample size, n, gets larger, the variability of the sampling distribution gets larger. (Points : 3) True False Question 7.7. In research, random sampling is necessary to avoid any form of error. (Points : 3) True False Question 8.8. A collection of items, measurements, or entities taken from a population in such a manner as to ensure each has the same chance of being included is a simple random sample. (Points : 3) True False Question 9.9. Simple random sampling is the only method to ensure a representative sample can the selected. (Points : 3) True False Question 10.10. Type I Error occurs when the null hypothesis is true but is rejected. (Points : 3) True False Question 11.11. When a decision is made to retain a false null hypothesis, a Type II Error occurs. (Points : 3) True False Question 12.12. When selecting an alpha level to conduct a hypothesis test, the researcher is determining the probability of making a Type I Error. (Points : 3) True False Question 23.23. If the coefficient of correlation is 0.80, the coefficient of determination is 0.64. (Points : 3) True False Question 25.25. For an inverse relationship between two variables, the sign of the correlation coefficient is "+". (Points : 3) True False Question 17.17. For a one-tailed hypothesis test, the critical z value of the test statistic is -2.33. Which of the following is true about the hypothesis test? (Points : 3) a = 0.05 for a lower-tailed test a = 0.01 for an upper-tailed test a = 0.05 for an upper-tailed test a = 0.01 for a lower-tailed test Question 20.20. A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the decision for a statistical significant change in average weights at birth at the 5% level of significance? (Points : 3) Reject the null hypothesis and conclude the mean is higher than 6.6 pounds. Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Fail to reject the null hypothesis. Cannot calculate because the population standard deviation is unknown. Question 21.21. The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. Does the sample data show a significant increase in the average birthrate at a 5% level of significance? (Points 3) Fail to reject the null hypothesis and conclude the mean is 6.6 pounds. Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Cannot calculate because the population standard deviation is unknown. Reject the null hypothesis and conclude the mean is greater than 6.6 pounds. : Question 3.3. In the sampling distribution of the sample means, the standard error of the mean will vary according to the size of the sample. As the sample size, n, gets larger, the variability of the sampling distribution gets larger. (Points : 3) True False Question 7.7. In research, random sampling is necessary to avoid any form of error. (Points : 3) True False Question 8.8. A collection of items, measurements, or entities taken from a population in such a manner as to ensure each has the same chance of being included is a simple random sample. (Points : 3) True False Question 9.9. Simple random sampling is the only method to ensure a representative sample can the selected. (Points : 3) True False Question 10.10. Type I Error occurs when the null hypothesis is true but is rejected. (Points : 3) True False Question 11.11. When a decision is made to retain a false null hypothesis, a Type II Error occurs. (Points : 3) True False Question 12.12. When selecting an alpha level to conduct a hypothesis test, the researcher is determining the probability of making a Type I Error. (Points : 3) True False Question 23.23. If the coefficient of correlation is 0.80, the coefficient of determination is 0.64. (Points : 3) True False Question 25.25. For an inverse relationship between two variables, the sign of the correlation coefficient is "+". (Points : 3) True False Question 17.17. For a one-tailed hypothesis test, the critical z value of the test statistic is -2.33. Which of the following is true about the hypothesis test? (Points : 3) a = 0.05 for a lower-tailed test a = 0.01 for an upper-tailed test a = 0.05 for an upper-tailed test a = 0.01 for a lower-tailed test Question 20.20. A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the decision for a statistical significant change in average weights at birth at the 5% level of significance? (Points : 3) Reject the null hypothesis and conclude the mean is higher than 6.6 pounds. Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Fail to reject the null hypothesis. Cannot calculate because the population standard deviation is unknown. Question 21.21. The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. Does the sample data show a significant increase in the average birthrate at a 5% level of significance? (Points 3) Fail to reject the null hypothesis and conclude the mean is 6.6 pounds. Reject the null hypothesis and conclude the mean is lower than 6.6 pounds. Cannot calculate because the population standard deviation is unknown. Reject the null hypothesis and conclude the mean is greater than 6.6 pounds