### Assignment Instructions/ Description

Image transcription textThree 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 = 177.90. Assume a population standard deviation of o = 7.91. These students were all classified as high on their need for

mean score for students who are high on the need for closure? (Round your answer up to the nearest whole number.)

closure. Assume that the 78 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 2.3 points of the population

LA USE SALT

students

4. [-/9.09 Points]

DETAILS

BBUNDERSTAT 13 7.R.007.S.

MY NOTES

ASK YOUR TEACHER

The Wind Mountain archaeological site is located in southwestern New Mexico. Wind Mountain was home to an ancient culture of prehistoric Native Americans called Anasazi. Suppose that a random sample of excavations at Wind Mountain gave the following

depths (in centimeters) from present-day surface grade to the location of significant archaeological artifacts.

84

44

119

79

76

54

64

66

94

91

69

76

56

In USE SALT

(a) Use a calculator with mean and sample standard deviation keys to find the sample mean x and sample standard deviation s (in cm). (Round your answers to four decimal places.)

1 X

cm

cm

values to one decimal place.)

Compute a 95% confidence interval for the mean depth (in cm) / at which archaeological artifacts from the Wind Mountain excavation site can be found. (Enter your answer in the form: lower limit to upper limit. Include the word "to." Round your numerical

cm... Show more