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Byers and Williams (1987) studied the impact of temperature (the independent variable) on the viscosity (the response) of toluene-tetralin blends.
Temperature Viscosity
24.9 1.1330
35.0 0.9772
44.9 0.8532
55.1 0.7550
65.2 0.6723
75.2 0.6021
85.2 0.5420
95.2 0.5074
a. Make a scatterplot of the data.
b. Obtain the prediction equation.
c. Perform a complete, appropriate analysis. Discuss your results and conclusions.
d. Calculate and plot the 95% confidence and prediction bands.
The sample mean was found to be 194 pounds with a standard deviation of 11.2 pounds. What percentage of men have weights between 175 and 2235 pounds?
an inspector correctly identifies defective products 90 of the time. for the next 10 products the probability that he
From past estimates, manager thinks that about 4% of customers have expressed dissatisfaction. What sample size must you use for this survey?
An LU professor is interested in whether there is a difference between undergraduate students and graduate students in the amount of time spent praying each day.
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
Assume each lifetime is independent. Round your answer to four decimal places (e.g. 98.7654). What is the probability that the lathe will operate at least seven years?
The customers arriving between 0 and 1 have to wait until the store opens. Suppose X is the total times that these customers have to wait. Calculate Var(x).
According to an exit poll taken by CNN during the 2008 Democratic Primary in Connecticut, 552 registered voters voted for Hilary Clinton and 598 for Barack Obama. Would you have been willing to predict Obama as the winner?
The sensitivity of a test is the probability that a person having the disease will test positive (indicating the person has the disease, i.e., it's the probability the test will pick up the fact that a person has the disease).
Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance among the average performance of the bus drivers. Use the following information to conduct the te..
Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 406 jawbreakers that weigh more than .4 ounces?
In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants results in 58 failures. Does the ..
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