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1. From a sample of size 20 taken from an approximately normal popula- tion it was determined that s2 = 5.36. Find a 90% confidence interval for σ .
2. A random sample of 17 high school students was selected from the senior class. It was found that the standard deviation of their summer hourly wage rates was $4.35. Find a 90% confidence interval for the true variance of the hourly wage rate for all seniors who had summer jobs. What assumption is required in order to find the said interval?
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
Scores on the ACT test have a mean of 21.1 and a standard deviation of 4.8. which is relatively better: a score of 1840 on he SAT or a score of 26.0 on the ACT test? why?
The standard deviation of a list of numbers is a measure of how much the numbers deviate from the averag
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
A production line operates with a mean filling weight of 500 grams per container. Over filling or under filling presents a serious problem and when detected requires the operator to shut down the production line to readjust the filling mechanism.
suppose that the specifications on the diameter of a rotor shaft are 0.25plusmn0.002. if the diameters are distributed
Show all necessary components of a full hypothesis test, including a source table - Can the office determine if there was a significant difference between the waiting room conditions
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
What is the 99% confidence interval, if the population standard deviation is known to be 10 days? What is the 99% confidence interval, if the sample standard deviation is 10 days?
in a certain parking lot 45 of the cars have four doors 16 of the cars are blue and 4 of the cars have four doors and
The height of a tree will be measured using a clinometer. For this device, the measurement error has a normal distribution with mean meter and standard deviation . If the tree is exactly 35 meters tall, what is the probability that the clinometer ..
according to some research males have better spatial skills than do females and according to other research females
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