Question
In: Math
A math professor claims that the standard deviation of IQ scores of the students majoring in...
A math professor claims that the standard deviation of IQ scores of the students majoring in mathematics is different from 15, where 15 is the standard deviation of IQ scores for the general population. To test his claim, 10 students were surveyed and their IQ scores were recorded. 120, 110, 113, 123, 119, 160, 220, 119, 110, 140 Test the professor’s claim using a 0.01 level of significance.
Solutions
milcah answered 1 year agoRelated Solutions
the average scores of math students in a certain school is 75 with a standard deviation...
the average scores of math students in a certain school is 75
with a standard deviation of 8.1. one hundred students were
randomly selected, and the average score was found to be 71. the
director wants to know wether students have deteriorated.
significance level is 0.01
1) the hypotheses are ?
2)Decision and conclusion ?
3) the critical value is ?
4) the test statistic is ?
What is the standard deviation of students math test scores? 12 18 27 31 40 42...
What is the standard deviation of students math test scores? 12
18 27 31 40 42 14 20 27 32 40 51 14 20 27 32 40 56 14 21 29 32 40
60 16 23 31 36 40 65
IQ test scores are normally distributed with a mean of 100 and a standard deviation of...
IQ test scores are normally distributed with a mean of
100 and a standard deviation of 15. An individual's IQ score is
found to be 123.
A.What percentage of individuals will score above
123?
B.What percentage of individuals will score below
123?
c. What percentage of individuals will score between
123 and 100?
d. This individual was trying to be in the 80th
percentile; did they achieve this? how can you tell?
e. what can we say about someone with...
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15....
IQ scores are normally distributed with a mean of 100 and a
standard deviation of 15.
A) If one person are randomly selected, find the probability the IQ
score is greater than 112.
B)If one person are randomly selected, find the probability the IQ
score is less than 95.
C)If one person are randomly selected, find the probability the IQ
score is between 97 and 110.
D) If 16 people are randomly selected, find the probability the IQ
score will...
assume that IQ scores are normally distributed with a mean of 100 and a standard deviation...
assume that IQ scores are normally distributed with a
mean of 100 and a standard deviation of 15.
Find the probability that a randomly selected person has
an IQ score less than 115.
Find the probability that a randomly selected person has
an IQ score greater than 118.
Find the probability that a randomly selected person has
an IQ score between 88 and 112.
Assume that IQ scores are normally distributed with a mean of 100 and standard deviation of...
Assume that IQ scores are normally distributed with a mean of
100 and standard deviation of 12. Find the probability that: (a) a
randomly selected person has an IQ score less than 92. (b) a
randomly selected person has an IQ score greater than 108.
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15....
IQ scores are normally distributed with a mean of 100 and a
standard deviation of 15.
a) Find the proportion of the population that has an IQ higher
than 94
b) Find the proportion of the population that has an IQ
between 82 and 88
c) Find the IQ score that seperates the highest scoring 67%
from the rest of the population
Critical Values
Z0.05=
1.645
Z0.025=1.96
Z0.01=2.325
Z0.005=2.575
Assume that IQ scores are normally distributed with a mean of 100 and a standard deviation...
Assume that IQ scores are normally distributed with a mean of
100 and a standard deviation of 15.. If 25 people are randomly
selected, find the probability that their mean IQ score is less
than 103. (a) .1587 (b) .8413 (c) 1.000 (d) .9938 23 Refer to
question 19 above. If 100 people are randomly selected, find the
probability that their mean IQ is greater than 103. (a) .8413 (b)
2.000 (c) .9772 (d) .0228 24 True or False. Because...
IQ Scores are normally distributed with a mean of 100 and a standard deviation of 15....
IQ Scores are normally distributed with a mean of 100 and a
standard deviation of 15. Use this information and a Z-table (or
calculator or Excel) to solve the following problems.
A. Ryan has an IQ score of 118. Calculate the z-score for Ryan's
IQ.
B. Interpret the z-score you obtained in the previous
problem.
C. Suppose an individual is selected at random. What is the
probability that their IQ score is less than 111? Round your answer
to four...
IQ test scores are normally distributed with a mean of 100 and a standard deviation of...
IQ test scores are normally distributed with a mean of 100 and a
standard deviation of 16. Find the probability that a randomly
selected person has an IQ score:
Less than 90.
Between 97 and 118.
Greater than 125.
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