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Q1) Placement exam is provided to 36 randomly chosen college students. Their mean score is 63.6 with standard deviation of 15.1 points. Create a 90% confidence interval for mean score on this placement exam for all students.
a) 23.48 < = mean <= 27.32
b) 2.42 <= mean <=3.98
c) 59.46 < = mean < = 67.74
d) 17.70 < = mean < = 18.90
Now compute the standard deviation for this distribution.
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
Labor negotiations estimate that 30 percent of all major contract negotiations result in a strike. During the next year, 12 major contracts must be negotiated. Determine the following probabilities.
The results of a recent poll on the preference of shoppers regarding two products are shown below.
The mean maximum oxygen uptake for elite athletes has been found to be 80 with a standard deviation of 8.1. Assume that the distribution is approximately normal.
Dividend is expected to grow 7% a year for next 3 years and then at 5% a year after that. Determine the expected dividend per share for each of the next five years?
At 95% confidence using the critical value approach, test to see if the percentage of defective systems produced by x-Game has exceeded the industry standard.
Find out the forecast value utilizing three month moving average method, weighted moving average method, exponential smoothing and regression methods.
At α = .01, did yellow fire trucks have a considerably lower accident rate? Determine sample proportions and z test statistic.
The researcher found that Lincoln's educational score did not correlate with the expected variables.
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Make a scatter plot, illustrate the regression lines. Determine the correlation coefficient between husband’s and wife’s education for couples in which wife is employed full time?
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