Bus Stat Midterm.docx

BUSINESS STATISTICS

MIDTERM EXAMINATION NAME:___________________________________________________________ SECTION:___________________________________________________

DATE:_______________________________________ INSTRUCTOR: Ms. Lea Lapie

A class was given a spelling test made up of 100 words resulting in the following scores: Find the MEAN, MEDIAN, MODE, STANDARD DEVIATION, and VARIANCE. 46

80

57

59

94

76

48

48

61

65

86

65

64

60

63

68

41

66

76

64

68

67

68

27

78

59

72

71

67

68

Given the following frequency distribution, calculate for: MEAN, MEDIAN, MODE, STANDARD DEVIATION, and VARIANCE. Class interval 60-62 57-59 54-56 51-53 48-50 45-47 42-44 39-41 36-38 33-35

f 2 2 4 5 11 8 4 2 1 1

About 10% of the human population is left-handed. Suppose a researcher at Penn State speculates that students in the College of Arts and Architecture are more likely to be left-handed than people found in the general population. We only have one sample since we will be comparing a population proportion based on a sample value to a known population value.

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Research Question: Are artists more likely to be left-handed than people found in the general population? Response Variable: Classification of student as either right-handed or left handed State Null and Alternative Hypotheses Null Hypothesis: Students in the College of Arts and Architecture are no more likely to be left-handed than people in the general population (population percent of left-handed students in the College of Art and Architecture = 10% or p = .10). Alternative Hypothesis: Students in the College of Arts and Architecture are more likely to be left-handed than people in the general population (population percent of left-handed students in the College of Art and Architecture > 10% or p > .10). This is a one-sided alternative hypothesis.