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in previous tests baseballs were dropped 24 ft onto a concrete surface, and they bounced an average 92.84 in. In a test of a sample of 40 new balls the bounce heights has a mean of 92.67 and standard deviation 1.79 in. Use a 0.05 significance level to determine whether there is suffcient evidence to support the clain that the new balls have bounce heights with a mean different from 92.84 in. Does it appear that the new baseballs are different?
The distribution of test scores is mui=35 and a standard deviation of 15. Do students taking the supplement have significantly better memory scores? Use a one-tailed t-test with an alpha=0.05.
On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows:
Basic Statistics problem
Determine the probability distribution associated with these data.
A person's body temperature is found to be 101.00 °F. Is the result unusual? Why or why not? What should you conclude? What body temperature is the 95th percentile?
Test the null hypothesis that these Arizona students scored the same as the North Dakota students. (238 North Dakota students had a mean of 525)What t-statistic do you obtain?
A sample of 30 cookies is taken to test the claim that each cookie contains at least 9 chocolate chips. The average number of chocolate chips per cookie in the sample was 7.8 with a standard deviation of 3.
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
The length of a rectangular swimming pool is 2x - 1 meters, and the width is x + 2 meters. Write a polynomial that represents the area. Find the area if x is 5 meters.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
A cereal manufacturer seeks to test their newest product against competitor's. A group of 100 children was asked to measure each brand, and then to express a preference.
The largest salary on the list is $100,000 and is accidentally changed to $1,000,000. What is the new standard deviation?
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