Answer:
Given,
xbar = 176.50
s = 8.11
n = 68
alpha = 1 - 0.99
= 0.01
Now critical value = z(alpha/2) = z(0.005) = 2.58 [since from z table]
Now consider,
Interval = xbar +/- z*s/sqrt(n)
substitute values
= 176.50 +/- 2.58*8.11/sqrt(68)
= 176.50 +/-2.5374
= (176.50 - 2.5374 , 176.50 + 2.5374)
= (173.9626 , 179.0374)
Now it is given,
For 99% confidence interval , E = 1.8
cosider,
n >= (z*s/E)^2
substitute values
= (2.58*8.11 / 1.8)^2
= 135.125
= 135
So the sample size = 135
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 70 students in the highest quartile of the distribution, the mean score was x = 176.50. Assume a population standard deviation of σ = 7.85. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 73 students in the highest quartile of the distribution, the mean score was x = 176.90. Assume a population standard deviation of σ = 8.11. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 78 students in the highest quartile of the distribution, the mean score was x = 176.50. Assume a population standard deviation of σ = 8.09. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 68 students in the highest quartile of the distribution, the mean score was x = 175.70. Assume a population standard deviation of σ = 7.53. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 80 students in the highest quartile of the distribution, the mean score was x = 176.70. Assume a population standard deviation of σ = 8.31. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 81 students in the highest quartile of the distribution, the mean score was x = 176.10. Assume a population standard deviation of σ = 7.65. These students were all classified as...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 75 students in the highest quartile of the distribution, the mean score was x = 177.70. Assume a population standard deviation of σ = 8.37. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 70 students in the highest quartile of the distribution, the mean score was x = 177.70. Assume a population standard deviation of σ = 8.19. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 70 students in the highest quartile of the distribution, the mean score was x = 178.90. Assume a population standard deviation of σ = 7.61. These students were all classified...
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 67 students in the highest quartile of the distribution, the mean score was x = 177.70. Assume a population standard deviation of σ = 7.81. These students were all classified...