The Stanford-Binet IQ test has scores that are normally
distributed with a mean of 100. A...
The Stanford-Binet IQ test has scores that are normally
distributed with a mean of 100. A principal in an elementary school
believes that her students have above average intelligence and
wants verification of her belief. She randomly selects 20 students
and checks the student files. She finds the following IQ scores for
these 20 students. IQ scores: 110,132, 98, 97, 115, 145, 77, 130,
114, 128, 89, 101, 92, 85, 112, 79, 139, 102, 103, 89
a. Compute the sample...
A Psychology professor, teaching at a large university, wants to
know whether there is a difference...
A Psychology professor, teaching at a large university, wants to
know whether there is a difference between the IQs of male and
female students in attendance. She randomly and independently
selects 20 female and 20 male students and has them take the IQ
test. The resulting IQ data are as follows:
Female: 130, 117, 124, 120, 125, 109, 100, 118, 127, 130, 126, 118,
131, 104, 130, 116, 122, 115, 129, 117
Male: 106, 114, 134, 120, 107, 131, 133,...
You know that the US population in 1980 had an average IQ score
of 100, with...
You know that the US population in 1980 had an average IQ score
of 100, with a standard deviation of 1.5. The data records
information on 900 young males (26 to 36 years old) from NLSY (the
National Longitudinal Surveys), surveys conducted in 1980, show an
average IQ score of 101. As a result, you suspect that the young
males have a slightly higher average IQ than the population. If the
standard deviation of the IQ scores for them is...
2. A critic says to the investigator: “You should not assume
that you know s for...
2. A critic says to the investigator: “You should not assume
that you know s for your population of 5th graders. The
standard deviation for them could be different from s for the
general population.” The investigator still wants to do a null
hypothesis significance test using the same data from four
children, with Ho: mu = 100, but without assuming that s is
known.
She decides to use the known m and s, adopts an a of .05, and...
Question1: It is known the population IQ score follows a normal
distribution with mean as 100,...
Question1: It is known the population IQ score follows a normal
distribution with mean as 100, SD as 10. A researcher is interested
in studying if the average IQ of students from statistics courses
on average has a higher IQ score than the population IQ score. To
test this hypothesis, the researcher randomly collected a sample of
25 students from statistic class, the mean IQ score for this sample
is 110. Compete for the hypothesis test at significant level.
Step...