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The z-score for a particular number (x) is -1.25, where the values have a mean of 175.0 and a standard deviation of 12.0. Find the particular number (x)
Give a 95% confidence interval for the mean blood phosphorus level for 5.4 5.2 2.5 4.9 5.7 and 6.3 mg/dL. Also, what sample size would be needed for a margin of error of 0.25 mg/dL for 95% confidenc
In a sample of 400 people, 250 indicated that they prefer domestic wines, while 140 said they prefer European wines, and 10 indicated no preference. we want to use the sign test to determine if ther
The percentage of squirrels that test positive for rabies is 6%. What is the probability that for the next 10 squirrels examined, at most 2 test positive for rabies?
A manufacturer claims the average life of a product is 500 hours. The lifetime of the product is assumed to follow an exponential distribution. What is the probability that the product will last les
The salespeople at Quality Motor Bikes sell up to 5 bikes a month. The probability distribution is as follows in the table below. What is the expected number of bikes sold during a month?
McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the min
As part of a study of grade inflation, you want to estimate the mean GPA of all current college student in the U.S. All GPAS are to be standardized for a scale between 0 and 4.
The following table shows part of the probability distribution for a random variable x. The mean of the above distribution is known to be 1.8 (i.e., E(x) = 1.8). Determine f(1) and f(3).
An eight-cylinder car has two cylinders that are defective and need to be replaced. If the mechanic randomly selects two cylinders in a row without replacement, to test for repair, what is the proba
Super Cola sales breakdown is 80% regular soda and 20% diet soda. Of the regular soda, 60% are purchased by men. Of the diet sodas, 30% are purchased by men. If a woman purchases Super Cola, what is
Nine coins are tossed. Let X be the number of coins that turn up heads. Find P(X = 4) and P(X = 6).
Suppose the lifetime of a particular appliance follows an exponential distribution with a mean of 10 years. What is the probability that the appliance will fail in less than 5 years?
The data in the table below indicate total cholesterol level for each participant before and after taking the herb. Is there a significant difference in total cholesterol after taking the herb? Use
Suppose that 30% of a group of people have hazel eyes. Assume that passengers boarding the plane form a randomly chosen group. What is the probability that passenger 17 is the 3th one having hazel e
The probability is 33 % that a message sent over a communication channel is garbled. If the message is sent repeatedly until it is transmitted reliably, and if each time it takes 5 minutes to proces
The size of fish in a lake follows a Normal Distribution with mean m = 1 lb 4 oz and standard deviation s = 3 oz . Fish that weigh less than 1 lb 9 oz must be released back into the lake. Bill
A certain type of engine suffers a critical failure with probability 1.59% each start. What is the probability of a critical failure occurring on the 20th start of this engine?
A basket of 1000 parts is selected at random from a shipment of 50 baskets. The chance of any single part being defective is 0.05. The entire 1000 parts in this one basket are examined. What are the
IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. An individual?s IQ score is found to be 110. Find the z-score corresponding to this value.
The presence of carbohydrate-deficient transferritin (CBT) in the blood is a marker for alcohol abuse. A study was performed to determine the ability of a laboratory technique to evaluate carbohydra
One slot machine pays off 1/2 of the time, while the other pays off 1/4 of the time. We pick one of the machines and play it 6 times, winning 3 times. What is the probability we are playing the mach
If this branch of the military changes the height requirements so that all women are eligible except the shortest 1 percent and the tallest 2 percent, what are the new height requirements?
What is the confidence interval estimate of the population mean?
TRUE OR FALSE: A t-statistic estimates the standard error by using the sample variance to approximate the population variance.