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Four buses carrying 160 high school students arrive to Montreal. The buses carry, respectively, 34, 48, 29, and 49 students. One of the studetns is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y.
The standard deviation equaled five days. Assuming that the distribution is normal, what percent of the invoices were paid within 15 days of receipt?
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
It is known that in a sack of mixed bean seeds, 35% are yellow beans. Use the normal approximation to the binomial distribution to find the probability that in a sample of 400 beans there are
The NY Dept of Motor Vehicles (DMV) designs its license plates with space for 7 letters or numerals. In the most recent iteration, the DMV uses three letters followed by 4 numbers.
How variable is the number of service calls with which Sam's department must deal?
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
If Larry gets a 70 on a physics test where the mean is 65 and the standard deviation is 5.8, where does he stand in relation to his classmates?
A statistically significant result occurs when the value of the test statistic falls in the rejection region. A result has practical significance when it is statistically significant
Consider a random variable Y, and a constant theta such that (1/theta)Y is distributed exponentially. Derive the lower and upper bounds for a 90% confidence interval for theta (These will be a function of y). Noe that theta=1/lambda where lambda i..
Standard deviation 0.3 ton. What is the probability that a fully loaded truck of this model is (a) less than 6 tons, (b) more than 7 tons, (c) between 6 and 7 tons?
Describe the population of interest and calculate the numerical value of the statistic that that the EPA will use to estimate p. Construct a 95% confidence interval for the proportion of Americans who live in neighborhoods with acceptable levels of ..
A two-way ANOVA model was used to analyze an experiment with two levels of one factor, three levels of a second factor, and 6 observations per treatment combination.
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