High school graduates: The National Center for Educational Statistics reported that 82% of freshmen entering public high schools in the U.S. in 2009 graduated with their class in 2013. A random sample of 135 freshmen is chosen.
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a. |
Page 333 Find the mean μ. |
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b. |
Find the standard deviation σ. |
|
c. |
Find the probability that less than 80% of freshmen in the sample graduated. |
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d. |
Find the probability that the sample proportion of students who graduated is between 0.75 and 0.85. |
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e. |
Find the probability that more than 75% of freshmen in the sample graduated. |
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f. |
Would it be unusual if the sample proportion of students who graduated were more than 0.90? |
In: Statistics and Probability
In 2010, 76.3% of college students enrolled in an education
major were female. A sample of students enrolled in an education
major in 2019 consisted of 115 females and 70 males.
Would this data be sufficient at the 0.01 level of significance to
conclude that the percentage of females enrolled in an education
major decreased from the 76.3%?
Use the P-Value Method of Testing.
In your work space below, you will need to have -
1. The null hypothesis, Ho
2. The alternative hypothesis, H1
3. The test statistic
4. The type of test(left, right, two-tailed) and the p-value
5. The decision to accept Ho or reject Ho
In: Statistics and Probability
Suppose a consumer organization was interested in studying weekly food & living expenses of college students living on college campuses in New York State. A survey of 40 students yielded the following (ordered array) to the nearest 10 cents.
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38.3 |
50.0 |
54.5 |
60.0 |
|
39.4 |
50.5 |
55.6 |
61.2 |
|
40.0 |
51.2 |
56.3 |
62.3 |
|
41.2 |
51.7 |
57.0 |
63.8 |
|
43.7 |
51.8 |
57.0 |
64.0 |
|
45.0 |
52.0 |
57.4 |
64.5 |
|
47.5 |
53.8 |
58.5 |
65.0 |
|
48.2 |
53.8 |
58.5 |
65.0 |
|
48.5 |
54.0 |
59.4 |
66.2 |
|
50.0 |
54.0 |
60.0 |
67.0 |
I want to know how to find the bins, variables and the midpoints
In: Statistics and Probability
In: Statistics and Probability
I NEED PLEASE ENVIRONMENTAL ANALYSIS IN UBER MARKETING PLAN THE PLACE IS CYPRUSS MAGUSA (FACULTY , MARKET)
I. ENVIRONMENTAL ANALYSIS THAT CONCLUD JUST
Competitive forces
B. Target Market(s) CYPRUSS MAGUSA
THE MINIMUM 4PAGES THE CLASS IS MARKETING.
THANK YOU. locals are students who go to the university and tourists who go to the castle its tourist city and there is a lot of students for the market conditions Northern Cyprus's economy operates on a free-market basis, with a significant portion of administration costs funded by Turkey. The TRNC uses the Turkish lira as its currency, which links its economic situation to the Turkish economy.
In: Economics
One group of students argues that every day, the average student must travel at least 25 minutes in one direction to get to college. The university's admissions office obtained a random sample of 30 travel times at a student address. The sample had a mean of 19.5 minutes and a standard deviation of 9.5 minutes. Does the admissions office have enough evidence to reject what the students have said? Use α = 0.01 Answer the following: Hypothesis test: Ho: μ = versus H1: μ Using the classical method: The value of the test statistic (to two decimal places) is: The critical value is: The decision is: Conclusion:
In: Statistics and Probability
2. A survey of 200 students is selected randomly on a large university campus. They are asked if they use a laptop in class to take notes. The result of the survey is that 128 of the 200 students responded ”yes."
A. Find 98% confidence interval
B. How would the confidence interval change if the confidence level had been 90% instead of 98%?
C. How would the confidence interval change if the sample size had been 300 instead of 200? (Assume the same sample proportion.)
D. How large would the sample size have to be to
make the margin of error one fourth as big in the 98% confidence
interval?
In: Statistics and Probability
**Please work in R**
In a group of students, there are 2 out of 18 that are left-handed.
a. Assuming a low-informative prior probability distribution, find the posterior distribution of left-handed students in the population. Summarize your results with an estimation of the mean, median, mode, and a 95% credible interval. Plot your posterior probability distribution.
b. According to the literature, 5 to 20% of people are left-handed. Take this information into account in your prior probability and calculate a new posterior probability distribution. Summarize your results with an estimation of the mean, median, mode, and a 95% credible interval. Plot your posterior probability distribution.
In: Statistics and Probability
The average math SAT score is 521 with a standard deviation of 114. A particular high school claims that its students have unusually high math SAT scores. A random sample of 60 students from this school was selected, and the mean math SAT score was 538. Is the high school justified in its claim? Explain.
answers is ( choose yes/or no) , because the z score ( which is? ) is ( choose, usual or not usual) since it ( choose, does not lie ,or lies) within the range of a usual event , namely within ( choose 1, 2 or 3 standard deviations) of the mean of the sample means. round to two decimal places as needed
In: Statistics and Probability
An instructor from the school of business samples the students in his introduction to business class to learn about the amount of dollars students spend per semester on textbooks. The distribution that follows indicates the results of his sample. SHOW WORK.
Textbook Costs per Student per Semester (in dollars)
65, 147, 171, 142, 153, 187, 195, 106, 127, 178, 178, 205, 175, 178, 133, 186, 55
In: Statistics and Probability