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1) A research study was conducted to examine the efficacy of studying in groups. Students were randomly assigned to one of three groups: a single person group (individual studying), a group that had two study partners, and a group that had three study partners. After four weeks of studying, the students were given an exam. The raw scores are below. The data are presented below.
Group 1
Group 2
Group 3
78
82
74
87
79
86
76
65
83
85
92
81
95
90
94
77
89
88
71
2) Mr. Rotondo is concerned about the level of knowledge possessed by various majors regarding United States history. Students from various majors in the three academic areas of the College were asked to complete a standardized U.S. history exam. The Academic area for students was also recorded. Data in terms of percent correct is recorded below for 30 students.
Natural Science
Social Science
Humanities
62
80
75
67
72
68
3) A genetics engineer was attempting to cross a tiger and a cheetah. She crossed 175 tigers and cheetahs. Based on prior research she expected that 25% of the animals would have a phenotypic outcome of stripes only: 25% would have 3 spots only: and 50% would have both stripes and spots. When the cross was performed and she counted the individual cubs she found 45 with stripes only, 41 with spots only and 64 with both.
a two factory research is used to evaluate the effectiveness of a new blood pressure medicine. in this two factor study
Determine the speed of the bullet. The spring has a stiffness k = 200 N.m and is originally unstretched.
According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients has ju..
However, in situations where growth has not eventually occurred, new operating systems have been announced 10% of the time. Based on all these facts, what is the probability that sales will grow by 10%?
Test the hypothesis that the choice of the major by undergraduate students in this university is independent of their gender. Use α = 0.01.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
jacob lee is a frequent traveler between los angeles and san francisco. for the past month we wrote down the flight
an interactive system consists of ten terminals that are connected to the central com- puter. at any time each terminal
Sample data have been collected, and the null hypothesis to be tested is H0: "The sample was drawn from a normal population in which µ, 5 130." If the analy- sis is based on a categorization that includes 8 cells:
The data given below are from a random sample of height (in inches) and weight (in pounds) of seven basketball players.
according to the empirical rule if the data form a bell-shaped normal distribution percent of the observation will be
The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds. find the probabality that a random collection of 16 songs will have a mean of 158.30 seconds or less?
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