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Last fall, a sample of n = 36 freshman was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of the freshman class. All freshman must take the same English Language Skills course, and the mean score on the final exam for the entire freshman class was µ = 74. The students in the new program had a mean score of M = 79.4 with a standard deviation of s = 18.
a. On the basis of these data, can the college conclude that the students in the new program performed significantly better than the rest of the freshman class? Use a one-tailed test with α = .05.
b. Can the college conclude that the students in the new program are significantly different than the rest of the freshman class? Use a two-tailed test with α = .05
Find out 90% confidence interval for mean grade of all the students in the class.
An experiment was conducted to compare the effects of two teaching styles for grade 12 mathematics. the individuals in experiment were grade 12 math students from one particular high school.
A company makes camshafts. The camshaft lengths need to be within a certain tolerance or they will not fit. They have produced x bar and s charts
The sample correlation coefficient between x and y is 0.375. It has been found out that the p-value is 0.256 when testing H0: ρ = 0 against the two-sided alternative H1: ρ ≠ 0. To test H0: ρ = 0 against the one-sided alternative H1: ρ > 0 at a sig..
Many people think that job satisfaction in workplace is directly related to annual income. To check the validity of this assumption survey of 430 active working adults in U.S was taken that relates their job satisfaction to their annual income.
The table below lists the number of audience impressions (in hundreds of millions) listening to songs and the corresponding numbers of albums sold (in hundreds of thousands).
Calculate the mean and standard deviation of the following data sets, then produce a five number summary and box plot of data.
What is your conclusion? Are the two variables independent?
Delivery Format The General Social Survey asks, "About how often did you have sex in the past 12 months?" About 47% of respondents indicated they had sex at least once a week.
Develop a pie chart to summarize these contributions. Develop a bar chart to summarize these contributions and why is it appropriate to construct a bar chart for these data instead of a histogram?
When using the normal distribution (empirical rule) to obtain the bounds for 99.73 percent of the value in a population, the interval generally will be ______the interval obtained for the same percentage if Chebyshev's theorem is assumed., shorter..
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
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