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The length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a mean of 4 minutes. What is the probability that a person is served in
Is this sample sufficient to conclude that the eye spots have a significant influence on the birds behavior? Use a two tail test with alpha =.05. Compute the estimated Cohen's d to measure the size
According to the hypothesis that the current year's seed does not meet the 85% germination rate standard at the 5% level of significance. What is the corresponding test statistic value?
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean
Suppose that the height of 100 male students at xyz represent a random sample of height of all 1546 student in a college,find 99% confidence interval for estimating their mean height and find 95% c
In a rural area, the infection rate of certain disease is 0.15. A sample of 25 people is taken from the area - selections are independent. Define X as the number of people in the sample who are infe
Assuming the tires are selected at random from among all tires being produced, how many tires in the shipment of 3000 are expected to have a lifetime that is less than 35,000 miles?
Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?
Military radar and missile detection systems are designed to warn a country of an enemy attack. A reliability question is whether a detection system will be able to identify an attack and issue a wa
If two televisions are randomly selected, compute the probability that both televisions work. what is the probability that at least one does not work?
To determine whether four population means are equal, a sample from each population was selected at random and using the Kruskal-Wallis test, H was computed to be 2.11. What is your decision at the
the results showed a sample mean of 5.1 cards with a sample standard veviation of 1.2. Is there convinving evidence at the .05 significance level to support the claim that the actual number of cards
Blacktop would like to buy enough ore to extract at least 8 tons of copper, 6 tons of zinc. Formulate and LP model for this problem using excel.
assume that weights of newborn children are normally distributed with a mean of 116 ounces and a standard deviation of 12 ounces . find the probability of randomly selecting a newborn child whose we
Suppose you take a random sample of 15 bearings and compute xbar = 8.2535. What is the probability that you will see a sample mean greater than xbar?
A plant efficiency expert randomly selects a location along 500-ft assembly line from which to observe the work habits of the workers on the line. What is the probability that the point she selects
The manufacturer has to replace or exchange 10% of its model I and 18% of its model II. If a model is selected at random, find the probability that it will be defective?
The traveling salesperson randomly selects 5 apartments in your building to visit. what is the probability that she visits both you and your neighbor bill?
This data shows the temperatures on randomly chosen days during a summer class and the number of absences on those days. (temperature, number of absences) Find the equation of the regression line fo
The standard deviation of the diameter of 18 baseballs was .29 centimeters. Find the 95% confidence interval of the true standard deviation of the diameter of the baseballs.
What is the probability of completing the exam in one hour or less? What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?
A population of 600 voters contains 252 Republicans, 300 Democrats, and 48 independents and members of other parties. A simple random sample of 60 voters will be drawn from this population. The cha
Test at 1% significance level that there exists a difference in proportion between men and women drivers who always use seat belts.
Only 3 reported that their health was excellent. Find the probability that when 13 adults are randomly selected, 3 or fewer are in excellent health.
A manufacturer claims that the mean lifetime, μ, of its light bulbs is 49 months. The standard deviation of these lifetimes is 6 months. Ninety bulbs are selected at random, and their mean lifet