Question
In: Statistics and Probability
Statistics grades: In a statistics class of 47 students, there were 17 men and 30 women....
Statistics grades: In a statistics class of 47 students, there were 17 men and 30 women. Three of the men and four of the women received an A in the course. A student is chosen at random from the class. (a) Find the probability that the student is a woman. (b) Find the probability that the student received an A. (c) Find the probability that the student is a woman or received an A. (d) Find the probability that the student did not receive an A.
Solutions
orchestra answered 2 years agoRelated Solutions
On a statistics test for a class of 40 students, the grades were normally distributed.The mean...
On a statistics test for a class of 40 students, the grades were
normally distributed.The mean grade was 74, and the standard
deviation was 8.
2. Janis scored 76 on this test.
A. What was her z-score for this grade
b. What percent of the class scored lower than Janis?
c. Approximately how many students in the class scored lower
than Janis?
3. The minumum passing grade on this test was 70. Approximately
how many students scored lower than 70...
A sample of scores for men and women from an examination in Statistics 201 were: Men...
A sample of scores for men and women from an examination in
Statistics 201 were:
Men
97
99
74
73
92
63
59
95
Women
60
83
72
49
45
53
61
66
61
95
58
Given that the null hypothesis and the alternative hypothesis
are:
H0: μm -
μw = 3
H1: μm - μw ≠
3
and using a 0.05 significance level conduct a t-test
about a difference in population means:
a)
What is the correct decision rule?...
A sample of scores for men and women from an examination in Statistics 201 were: Men...
A sample of scores for men and women from an examination in
Statistics 201 were:
Men
94
97
66
54
80
59
83
45
Women
57
56
48
98
84
55
70
94
Given that the null hypothesis and the alternative hypothesis
are:
H0: μm -
μw ≤ -4
H1: μm - μw
> -4
and using a 0.05 significance level conduct a t-test
about a difference in population means:
a)
What is the correct decision rule?
Reject H0 in...
Dean suspects that statistics teacher increase the grades of the class of 75 students due to...
Dean suspects that statistics teacher increase the grades of the
class of 75 students due to his endless love to his beloved
students. Dean realized that average grade of previous statistics
classes is 64 and she took some of the exams from student affairs
departments and note the following grades: 65 75 98 34 76 52 80 84
68. Please help dean to conduct a statistical analysis and (15
points) interpret the results. (15 points)
The failure rate in a statistics class is 20%. In a class of 30 students, find...
The failure rate in a statistics class is 20%. In a class of 30
students, find the probability that exactly five students will
fail. Use the normal distribution to approximate the binomial
distribution.
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a
large class were normally distributed with a mean of
70 and a standard deviation of 10. Use the TI-84 PLUS calculator
to answer the following. Round the answers to at least two
decimals.
(a) Find the 42nd percentile of the scores.
(b) Find the 71st percentile of the scores.
(c) The instructor wants to give an A to the students whose
scores were in the top 10% of the class. What...
17. In a random sample of 30 business students, the average time to complete a statistics...
17. In a random sample
of 30 business students, the average time to complete a statistics
exam was 43.4 minutes. Assume that the population standard
deviation to complete the exam is 8.7 minutes. The margin of error
for an 80% confidence interval around this sample mean is
________.
The following are final exam scores for 30 students in an elementary statistics class.
The following are final exam scores for 30 students in an
elementary statistics class.
91
59
82
91
79
76
90
69
77
83
59
88
95
72
88
81
77
52
80
96
62
97
76
75
75
89
61
72
90
85
a.
Find the quartiles for this data______________________________.
b.
What is the Interquartile Range (IQR)_________________________?
c.
What percent of students got at least a 72 on their final
exam______________?
d.
Build a boxplot using the graphing calculator.
17. Height of Men and Women in the U.S. Women: μ= 64 inches , σ =...
17. Height of Men and Women in the U.S. Women: μ= 64 inches , σ
= 3.5 Men: μ= 70 inches , σ = 4
a. calculate the z score that corresponds to a women height of
68 inches.
b. state the percentile ranking for that score.
c. for both women and men in the US, calculate the z score and
raw score (in inches) that separates the tallest 2.5% from the
97.5% of scores below.
d. for both women...
A medical experiment involved 35 men and 30 women of which 25 were randomly selected to...
A medical experiment involved 35 men and 30 women of
which 25 were randomly selected to take part in testing a new
medication.What is the probability that a)15were men?b)15 we're
women?
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