Mathematics, 15.07.2021 17:00 sehaamxoxo34
A random sample of 49 measurements from one population had a sample mean of 18, with sample standard deviation 5. An independent random sample of 64 measurements from a second population had a sample mean of 21, with sample standard deviation 6. Test the claim that the population means are different. Use level of significance 0.01
What distribution does the sample test statistic follow? Explain
a. The Student's t. We assume that both population distributions are approximately normal with known standard deviations
b. The standard normal. We assume that both population distributions are approximately normal with unknown standard deviations
c. The Student's t. We assume that both population distributions are approximately normal with unknown standard deviations d. The standard normal. We assume that both population distributions are approximately normal with known standard deviations.
Answers: 2
Mathematics, 22.06.2019 02:20, smelcher3900
There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?
Answers: 1
Mathematics, 22.06.2019 03:30, Salamonti
The diameter of a bacteria colony that doubles every hour is represented by the graph below. what is the diameter of the bacteria after 8 hours? graph of a curve passing through the points zero comma 1, one comma two, two comma four, and three comma eight
Answers: 1
A random sample of 49 measurements from one population had a sample mean of 18, with sample standard...
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