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A survey asks a random sample of 2500 adults in Ohio if they support an increase in the state sales tax from 5.25% to 5.50% with the additional revenue going to education. Suppose that 30% of all adults in Ohio support the increase. The probability that at least 800 people support the increase is?
The following data represent the service charge for direct-deposit customers if a customer's account falls below the minimum required $1,500 balance for a sample of 26 banks.
Dr. Richmond, a psychologist, is studying the daytime television viewing habits of college students.
Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sampl..
What if the number of debilitating network viruses detected in a day at the firewalls of an Internet service provider within a certain geographic region is fueling a possible management decision to upgrade the detection system.
With a confidence of 95%, what is the margin of error for the proportion of all carp that would incorporate the gene into their DNA?
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
In a random sample of 53 concrete specimens, the average porosity (in percent) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete.
The information that the distribution of the serve speeds was bell shaped. What proportion of the player's serves are expected to be between 107 mph and 118 mph?
In baseball, the term "batting average" is employed as one way to measure a player's offensive performance. If we were to consider the idea of batting average in statistical sense
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline.
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