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Assume that the manufacturer wants to be sure that the mean net content exceeds 12 oz. What conclusions can be drawn from data (use alpha=0.01).
Compute the numerical value of your test statistic, z0? Answer to two decimal places. Determine the p-value resulting from the test of Part I? Answer to three decimal places.
A company had 80 employees whose salaries are summarized in frequency distribution below. Determine the standard deviation. Compute the standard deviation of the data summarized in the listed freque
When investigating times required for the drive-through service, the following results (in seconds) were obtained. Determine the range, variance, and standard deviation for each of the two samples,
To obtain the best deal on the CD player, Tom called eight appliance stores as well as asked the cost of a specific model. The prices he was quoted are given below:
Use a z-table to find the percentage of the area under the standard normal curve between the two values. Round your answer to the nearest hundredth.
If a random sample of 10 customers has a sample mean of 6.03 minutes and a sample standard deviation of 0.125 minutes what is the probability that a randomly selected customer will spend more than 6
Use a table to find the percentage of the area under the standard normal curve between the two values. Round your answer to the nearest tenth.
A person repeatedly and independent flips a fair coin to decide whether to take a step to the left or to the right from a point X. Determine the expected number of times the person returns to X.
A floor consists of parallel planks which have a two foot width. A circular disc of diameter one foot is randomly and uniformly dropped onto the planks. Determine the probability that the disc does
The average employee in the U.S.A. spends µ = 23 minutes commuting to work each day. Assume that the distribution of commute times is normal with a standard deviation of s = 8 minutes. What is
Two fair six-sided dice are tossed independently. Let X be the firs die, and Y the value of second. Determine the expectation of the following random variables:
What is the probability of randomly selecting an employee who spends more than 35 minutes commuting each day?
At 95% confidence, what is the margin of error? Develop a 95% confidence interval estimate of the mean amount spent for dinner.
A random sample of the ages of 69 college students has a mean of 21. The population is known to be normal with a standard deviation, ?? , of 4. What is the standard error of the mean? (to 2 decimal
Six students, three boys and three girls, lineup in a random order for a photograph. What is the probability that the boys and girls alternate?
For the statistician's suggestion, what is the distribution of the number of tests needed for a group k residents? Define random variable, write down the probability mass function and state what kin
Confidence interval for the population mean: Use of the standard normal. The union for a particular industry has determined that the standard deviation of the daily wages of its workers is 19.
Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu. Assume that the population has a normal distribution.
A study was conducted to examine the relationship between the cost structure and the mechanical properties of equiaxed grains in unidirectionally solidified ingots.
The amount of rainfall in January in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation of 0.3 inches. Find the value of the quartile.
How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 4 percentage points.
Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution
An instant lottery scratch off game offers a 0.04 probability of winning on any one play. Plays are independent of each other. If you play 8 times, what is the probability you win at least once?