Question

In: Statistics and Probability

Data set for ages of students in stats class: 17, 18, 18, 18, 18, 18, 18,...

Data set for ages of students in stats class:

17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,19, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 25, 25, 25, 26, 26, 27, 28, 28, 28, 28, 29, 29, 32, 36, 42

1) Suppose we are trying to use this sample to infer something about the ages of all PSU students. Explain why this is not a truly random sample and how it may be biased compared to the PSU student population at large. How does this affect problem 2?

2) Find a 95% confidence interval for the true standard deviation of ages.

Solutions

Expert Solution

orchestra answered 2 years ago
Next > < Previous

Related Solutions

Data set for ages of students in stats class: 17, 18, 18, 18, 18, 18, 18,...
Data set for ages of students in stats class: 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,19, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 25, 25, 25, 26, 26, 27, 28, 28, 28, 28, 29, 29, 32, 36, 42 1) Find the standard deviation of the ages and use it to calculate a 95% confidence interval for the true mean age (be...
a. The following are the GPA's of a class of Stats students: 3.4, 3.1, 2.0, 2.3,...
a. The following are the GPA's of a class of Stats students: 3.4, 3.1, 2.0, 2.3, 3.3, 2.6, 1.8, 0.2, 3.1, 4.0, 0.7, 2.3, Construct the 99% CI. b.Would a 90% CI be larger or smaller?
A recent news article stated that only 17% of college students between the ages of 18 to 24 years old voted in the last presidential election.
A recent news article stated that only 17% of college students between the ages of 18 to 24 years old voted in the last presidential election.5. Assuming the voting rate stays the same, what is the probability that from a random sample of 500 college students from a local university, at least 20% will vote in the next presidential election?
Women (ages 18 to 25) heights Data Collection                                   &n
Women (ages 18 to 25) heights Data Collection                                                                                                                     Height (ft.) 1 5.0 2 5.4 3 5.4 4 5.5 5 4.11 6 5.8 7 5.1 8 5.3 9 5.4 10 5.5 11 5.7 12 5.8 13 5.10 14 5.7 15 6.3 13) Plot the third bell curve below: 14) What is the data value associated with a z-score of 0.5? _________________________ 15) What is the data value associated with a z-score of -2.4? _________________________ 16) What is the variance of this...
suppose that you are in a class of 18 students and It is assumed that 15%...
suppose that you are in a class of 18 students and It is assumed that 15% of the population is left handed. a. compute probability that exactly 5 students are left handed( 3 decimal places) b. probability that at most 4 students are left handed (3 decimal places) c. probability that at least 6 students are left handed (3 decimal places)
In a college algebra class there are 18 freshman and 17 sophomores. Eight of freshman are...
In a college algebra class there are 18 freshman and 17 sophomores. Eight of freshman are females and 13 of sophomores are male. Student is selected at random, probability of selecting a female? Three cards are drawn from a deck without replacement, what is the probability of selecting a king, a nine and a ten? A light bulb is advertised as lasting a 100 hours with a standard deviation of 1500 hours. Find the probability of buying a light bulb...
In an introductory statistics class, there are 18 male and 22 female students. Two students are...
In an introductory statistics class, there are 18 male and 22 female students. Two students are randomly selected (without replacement). (a) Find the probability that the first is female (b) Find the probability that the first is female and the second is male. (c) Find the probability that at least one is female --------------- I know that this question has to use the counting method, but i got confuse with how to start because i have to now find the...
The following data represent the final exam scores of 18 male students and 18 female students....
The following data represent the final exam scores of 18 male students and 18 female students. Male: 68, 68, 72, 73, 65, 74, 73, 72, 68, 65, 73, 66, 71, 68, 74, 66, 71, 65 Female: 59, 75, 70, 56, 66, 75, 68, 75, 62, 60, 73, 61, 75, 74, 58, 60, 73, 58 Is there any significant difference between the average exam scores of male and female students? Explain your answer using both confidence interval method and hypothesis test...
A physics class has 50 students. Of these, 17 students are physics majors and 16 students are female. Of the physic...
A physics class has 50 students. Of these, 17 students are physics majors and 16 students are female. Of the physics majors, seven are female. Find the probability that a randomly selected student is female or a physics major. The probability that a randomly selected student is female or a physics major is (Round to three decimal places as needed.)
a) TRUE OR FALSE: For a set of data with a mean of 18 and a...
a) TRUE OR FALSE: For a set of data with a mean of 18 and a variance of 25, approximately 68% of the values will fall between 13 to 23. b) Which of the following statement is true about the relationship between a sample and a population 1)Every sample is a perfect representation of a population 2)The sample size is smaller than a population size 3)Every member of a population is also in the sample 4)A population size is smaller...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT