Question

21 of my 61 MCU Math 270 students are female. Can we claim with a significance level of 5% that one third (0.33) of my MCU Math 270 students are female?

Answer #1

8. 21 of my 61 MCU Math 270 students are female. Can we claim
with a significance level of 5% that one third (0.33) of my MCU
Math 270 students are female?

Ali and Karim intend to investigate the average weight
of LIU female students. They claim that the average weight of LIU
female students is 65 kg. After collecting the necessary data (Ali
selected a larger random sample than that selected by Karim) and
performing the needed tests,
the following debate arised between them
Ali: At the 2% significance level, we can conclude that the average
weight of LIU female students is 65 kg.
Karim: But we may not conclude that...

Do students perform better on the Verbal section of the SAT
compared to the Math? 10 students were randomly selected and their
Math & Verbal scores are listed below. Test the claim that
students perform better on the Verbal section and the 5%
significance level using PHANTOMS.
Math
Verbal
640
470
660
650
550
580
560
660
600
790
560
640
550
660
600
560
540
560
540
560

data on the heights of 37 randomly selected female engineering
students at UH:
62 64 61 67 65 68 61 65 60 65 64 63 59
68 64 66 68 69 65 67 62 66 68 67 66 65
69 65 69 65 67 67 65 63 64 67 65
We found that the sample mean and sample standard deviation for
this sample data are 65.16 inches and 2.54 inches, respectively. Do
you find sufficient evidence in the sample data...

The proportion of female students at Lehman College is 68%.
Suppose there are 145 students enrolled in some major, of which 113
are female. Can we conclude that there is a higher proportion of
female students in this major than at Lehman overall? Use a
significance level of 0.01.
(a) What are the null and alternative hypotheses?
(b) What is the test statistic?
(c) What is the critical value?
(d) Do you reject or fail to reject the null hypothesis?...

College math instructors suggest that students spend 2 hours
outside class studying for every hour in class. So, for a 4-unit
math class, students should spend at least 8 hours (480 minutes)
studying each week. A statistics instructor randomly selected
students during the third week of the semesters, the number of
minutes students spent on studying are recorded below. At 0.05
level of significance to test the claim that students are studying
less than 480 minutes each week. Assume the...

A certain test preparation course is designed to improve
students' SAT Math scores. The students who took the prep course
have a mean SAT Math score of 507 while the students who did not
take the prep course have a mean SAT Math score of 501. Assume that
the population standard deviation of the SAT Math scores for
students who took the prep course is 45.7 and for students who did
not take the prep course is 32.1 The SAT...

A certain test preparation course is designed to improve
students' SAT Math scores. The students who took the prep course
have a mean SAT Math score of 507 while the students who did not
take the prep course have a mean SAT Math score of 501. Assume that
the population standard deviation of the SAT Math scores for
students who took the prep course is 45.7 and for students who did
not take the prep course is 32.1 The SAT...

Test the claim that for the population of female college
students, the mean weight is given by mu equals 132 space l b s.
Sample data are summarized as n = 20, x̅ = 137 lb, and s = 14.2 lb.
Use a significance level of α = 0.1. Assume that a simple random
sample has been selected from a normally distributed population.
Find the test statistic.
t-stat = 1.57
z-stat = 1.03
z-stat = 2.42
t-stat = 1.03

At the .05 significance level can we conclude that there is MORE
variation of sick days of men vs. women? 20 men took on average 10
sick days with a standard deviation of 4 days. 21 women took on
average 12 sick days with a standard deviation of 3 days. What can
you conclude?
C. Do not reject Ho. We can prove the claim that there is more
variation in sick days for men vs. women.
A. Reject Ho. We...

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