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Four buses carrying 154 high school students arrive to Montreal. The buses carry, respectively, 31, 45, 34, and 44 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?
Operators are to answer telephone calls from customers in an average time of 0.1 minute or less, and either respond to or refer to the proper department within 0.5 minute.
Can you conclude that information in article is untrue? Use 0.05 significance level. Find out p-value and explain its meaning.
In as sample of 855 bartenders, 48% report hearing complaints from patrons about their jobs. If the maximum error of estimate for the proportion of bartenders hearing job complaints is 4.4 percentage points, what is the degree of confidence used?
Let x be a random variable that represents the commute time of teachers in a large urban area. If x is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes, find the commute time which is at the top of the bottom 25..
If we assume that the download times are normally distributed, what percent of users will wait between 5 and 10 seconds for the homepage to download?
Using variables below, (1) mention all research questions that would be replied with a Two Way ANOVA test, (2) make null hypotheses for these questions.
Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the mea..
Assume X is an exponential random variable with parameter lambda. Find the method of moments estimator for lambda.
In a class of 40, 16 driver a car made outside the United States. What is the confidence interval for the total population of students at the 95% level?
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
100 M&M candies are randomly selected. The 100 weights have a standard deviation of 0.0518 g. Construct a 95% confidence interval estimate of the standard deviation of weights of all M&Ms.
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