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An economist wanted to analyze the relationship between the speed of a car (x) and its gas mileage (y). As an experiment a car is operated at several different speeds and for each speed the gas mile
Provide an explicit test of normality. Are the data normally distributed? State the formal hypotheses you will be testing.
A 95% Confidence Interval is generated. Which of the following would result in a confidence interval that was less wide (i.e. one with a smaller margin of error)? Answer
When playing a new board game, you are required to roll 6 standard six-sided dice. If X is the number of 6's rolled, the probability distribution looks like this:
The speed of cars (mph or miles/hour) on CA-60 freeway follows a normal distribution. A highway safety researcher believes that cars on CA-60 travel at an average speed of 70 mph. From a sample of 1
Gilroy Garlic Inc. prepackages three bulbs of garlic and ships them to stores for resale. Gilroy hopes that the garlic weighs about 6 grams, but there is no listed weight, so it is not essential tha
Acute rotavirus diarrhea is the leading cause of death among children under the age of 5, killing an estimated 4.5 million annually in development countries.
Determine the probability that this student gets either fourteen (14) or sixteen (16) answers correct. Approximate the probability obtained in part (i) by an area under a suitable normal curve.
We asked subjects how many siblings they had and what their average test score was in their Geography class. Draw a scatter plot showing the relationship between sibs and test scores. Test the degre
A used car dealership has found that for cars it sells that the length of time before a major repair is required is normally distributed with a mean of 11 months. If nine percent of cars sold at thi
Assume that 25% of all business students at a large university invest in the stock market. A random sample of 120 business students is selected from this university. What is the approximate probabil
An automobile manufacturer obtains the microprocessors used to regulate fuel consumption in its automobiles from three microelectronic firms: A, B, and C. The quality-control department of the compa
The alkalinity level of water specimens collected from the Han River in Seoul, Korea, has a mean of 50 milligrams per liter and a standard deviation of 3.2 milligrams per liter.
The athletic director claims that the attendance is the same as last year. If a = .05, what are the critical values for this two-tailed t test?
A student has submitted a concrete cylinder to the "strength contest" in Engineering Open House. Suppose the strength of her concrete cylinder is lognormally distributed with mean and standard devia
A certain diagnostic test is indicative of problems only if a child scores in the lowest 10% of all those taking the test. If the mean score is 150 with a standard deviation of 30, what would the di
Suppose you want to estimate a population proportion, p and p = 0.35, N=5,600, and n= 1,800. Find an approximate 95% confidence interval for p.
On the basis of these figures, a friend claims that the Right-to-Work laws are costing the average worker 50 cents per hour. Do you think this claim is justified? Assume a 5% level of significance.
Electrical engineers recognize that high neutral current in computer power system is a potential problem. A recent survey of computer power system load currents a U.S.sites found that 10% of the sit
Is the relative frequency of the ammonia level skewed to the right?
The theorem that states that the sampling distribution of the sample mean is approximetly normal when the sample size n is reasonably large is known as the
A 99% confidence interval for the mean of a normal population when the standard deviation ? is known is found to be 98.6 to 118.4. If the confidence level is reduced to .95, the confidence interval
GPA of freshmen students follows a normal distribution with mean 2.1 and standard deviation 0.6. How many freshmen will score between 2.5 and 3.5 if the class has 300 students?