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Kindergarten children have heights that are approximately normally distributed about a mean of 39.7 inches and a standard deviation of 2.2 inches. If a random sample of 21 is taken, what is the probability that the sample of kindergarten children has a mean height of less than 38.9 inches? (Give your answer correct to four decimal places.)
Exact answers only please.
Ten automobiles were driven on a measured test track - once with standard gasoline with no additive and once with an additive supposed to increase miles per gallon (mpg). The results are given below:
if you could stop time and live forever in good health what age would you pick? answers to this question were reported
1 joes grandfather on his mothers side was a lizard man on a circus sideshownbsp the result of rare x-linked recessive
A sample of 25 their average life from the time they are fully charges to the time they are fully discharged is 170 minutes the sample standard deviation is 30 minutes. Test the claim that battery will last for three hours.
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated.
A random sample of 20 users is obtained. Using the Binomial Probability Distribution, determine the following probabilities?
The applicants require to take the university examination for admission in engineering collage. Scores on the university are roughly normally distributed with a mean of 530 and a standard deviation of 115.
In drawing an inference using a single mean in hypothesis testing, you often have a choice between doing a z-test or a t-test. Many researchers will always choose to do the t-test even under circumstances where the z-test would work as well.
Calculate the standard deviation of the ages of the uninsured senior citizens correct to the nearest hundredth of a year.
List the five-number summaries of the number of days between the receipt of a complaint and the resolution of the complaint and construct boxplot and describe the shape of the distribution of the data.
1. What is the current status of the housing stock in the county?
the following data give the time in minutes taken to commute from home to umkc for 20 students.10 50 65 33 48 5 11 23
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