IN MINITAB High School Dropouts Approximately 10.3% of American high school students drop out of school before graduation. Choose 10 students entering high school at random. Find the probability that
a. No more than two drop out
b. At least 6 graduate
c. All 10 stay in school and graduate
In: Statistics and Probability
The authors of the article Boredom in Young adults–Gender and Cultural Comparisons administered the Boredom Proneness Scale to 97 male U. S. college students and found a sample mean of x = 10.40 with a sample standard deviation of s = 4.83. Calculate a 95% confidence interval for the true mean boredom proneness of male college students.
In: Statistics and Probability
A random sample of 900 college students found that 62% study outside of the class less than 2 hours per week. Construct a 90% confidence interval for the proportion of students who study less than 2 hours per week [5 points] . Interpret the results using complete sentences. [5 points]
In: Statistics and Probability
1. When 258 college students are randomly selected and surveyed, it is found that 106 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.
a.0.351 < p < 0.471
b.0.332 < p < 0.490
c.0.339 < p < 0.482
d.0.360 < p < 0.461
In: Statistics and Probability
A random sample of 400 female students revealed that 120 liked to study at the library. Similarly, a random sample of 600 male students revealed that 150 liked to study at the library. At the 0.05 significance level, is there a significant difference in the proportion of female and male who like to study at the library?
Please show calculation on paper. thank you.
In: Statistics and Probability
from past studies the average time college freshmen spend studying n 22 hours per week. The standard deviation is 4 hours. This year, 60 students were surveyed, and the average time that they spent studying was 20.8 hours. Test the claim that the time students spend studying has not changed. Use a=1%
In: Statistics and Probability
GRE math scores are normally distributed with a mean µ = 500 and
standard deviation, = 55. This year Howard University admitted
1500 graduate students.
Calculate:
a. the number of students with test scores above 520,
below 490, between 482 & 522
b. how high a score is needed to be in the top 10%,
top 5%?
In: Statistics and Probability
The number of times that students go to the movies per year has mean is a normal distribution with a mean of 17 with standard deviation of 8. What is the probability that for a group of 10 students, the mean number of times they go to the movies each year is between 14 and 18 times? (round your answer to the nearest hundredth)
***ANSWER IS NOT .2
In: Statistics and Probability
A class in probability theory consists of 3 men and 5 women. An exam is given, and the students are ranked according to their performance. Assuming that no two students obtain the same score, and all rankings are considered equally likely.
1.The probability that women receive the bottom 5 scores is
2.The probability that the top grade and the bottom grade are for men is
In: Statistics and Probability
The president of a University wishes to find the average age of students presently enrolled. From past studies, the standard deviation is known to be 2 years. A random sample of 50 students is selected and the mean is found to be 23.2 years.
A. Find the 95% confidence interval for the population mean.
B. Find the 99% confidence interval for the population mean?
In: Statistics and Probability