Question
In: Statistics and Probability
A student guesses blindly on a 20 question true/false test. a) Using the binomial probability formula,...
A student guesses blindly on a 20 question true/false test.
a) Using the binomial probability formula, find probability the student gets exactly 3 out 20 correct.
b) Using the binomial probability formula, find probability the student gets 3 or less questions correct.
c) Using a calculator or table of values, find probability the student gets at least a 60% score on the test.
Solutions
orchestra answered 2 years agoRelated Solutions
11) A student takes a true-false test that has 20 questions and guesses randomly at each...
11) A student takes a true-false test that has 20
questions and guesses randomly at each answer. Let X be the number
of questions answered correctly. Find P(19 or
more)
A) 0.1719
B) 0.006
C) 0.00002
D) 0.07
12) It is estimated that 35% of households own a riding
lawn mower. A sample of 10 households is studied. What is the
probability that more than 7 of these own a riding lawn mower?
(hint: you can use binomial or independent...
Question 12 A student takes an 8-question, true-false exam and guesses on each question. Find the...
Question 12
A student takes an 8-question, true-false exam and guesses on
each question. Find the probability of passing if the lowest
passing grade is 6 correct out of 8.
a.
0.109
b.
0.227
c.
0.144
d.
0.164
Question 13
R.H. Bruskin Associates Market Research found that 30% of
Americans do not think having a college education is important to
succeed in the business world. If a random sample of 5 Americans is
selected, find this probability: At most...
A student is making independent random guesses on a test. The probability the student guess correctly...
A student is making independent random guesses on a test. The
probability the student guess correctly is 0.5 for each question.
Assume that the guesses are independent. Find the probability of 13
or more correct in 20 guesses. Round your answer to 3 decimal
places.
1.) A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer....
1.) A student takes a ten-question true-false
quiz, but did not study and randomly guesses each answer. Find the
probability that the student passes the quiz with a grade of at
least 70% of the questions correct.
1. Identify
2.
First, find the number of correct questions needed to get 70%.
3. Then
write an appropriate probability statement.
4. Then
find the probability
2.) Suppose that about 85% of graduating
students attend their graduation. A group of 22 graduating students
is randomly...
A true/false test has ? = 20 questions. If a student is simply guessing the answers...
A true/false test has ? = 20 questions. If a student is simply
guessing the answers
(so there is a 50% chance of getting correct for each
question),
a) what is the mean and standard deviation of the number of
questions the student would get
correct?
Mean = ______, Standard deviation = ______
b) what is the approximate probability (approximated by a
normal distribution) that this student would get at least 15
questions correct?
P (at least 15 questions correct)...
Using the Binomial Distribution Assume that two students must take a ten question, True or False...
Using the Binomial Distribution
Assume that two students must take a ten question, True or False
quiz. Student 1 has not studied at all and guesses randomly on each
question. Student 2 has studied hard and has a 95% chance of
answering any particular question correctly.
For each student, calculate the probability of passing (getting
7 or more correct answers) and the probability of “acing” (getting
9 or 10 correct answers) the quiz.
What do your calculated probabilities say about...
1) Using the Binomial Distribution formula find the probability that a family that has 13 children...
1) Using the Binomial Distribution formula find the
probability that a family that has 13 children
has 10 girls.
2) Given the paired data set below of
Super Models ( heights and weights) to determine the line of
regression.
X
| 65 67 62
70 66
69 61
67 65
69
Y
|110 105 113 107
109 113 104
110 116 115
3) Calculate the Coefficient of
Correlation.
4) Using the data from problem 23 predict the weight
of a...
Question 1 The binomial formula has two parts. The first part of the binomial formula calculates...
Question 1
The binomial formula has two parts. The first part of the
binomial formula calculates the number of combinations of X
successes. The second part of the binomial formula calculates the
probability associated with the combination of success and
failures. If N=4 and X=2, and p = .5, what is that probability from
the second part of the formula?
Group of answer choices
.0625
.5
.3750
.1563
Question 2
Normal Distribution Problem. The birth weight
is of newborn babies...
Compute P(X) using the binomial probability formula. Then determine whether the normal distribution can be used...
Compute P(X) using the binomial probability formula. Then
determine whether the normal distribution can be used to estimate
this probability. If so, approximate P(X) using the normal
distribution and compare the result with the exact probability.
nequals62, pequals0.3, and Xequals8
Compute P(X) using the binomial probability formula. Then determine whether the normal distribution can be used...
Compute P(X) using the binomial probability formula. Then
determine whether the normal distribution can be used to estimate
this probability. If so, approximate P(X) using the normal
distribution and compare the result with the exact probability.
n=40, p=0.35, X=20 P (X) = Can the normal distribution be used to
approximate thisprobability? Approximate P(X) using the normal
distribution. Use a standard normal distribution table. Select the
correct choice below and fill in any answer boxes in your choice.
By how much...
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