Mathematics
Mathematics, 29.07.2019 12:30, tyijiapostell

Adistribution of scores has  = 20, but the value of the population mean is unknown. you plan to select a sample from the population in order to learn more about the unknown population mean. a. if your sample consists of n = 25 scores, how much error, on average, would you expect between your sample mean and the population mean (.5)?

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Mathematics, 10.07.2019 02:20, grales65
7.2 a population has a mean of ? = 80 and a standard deviation of ? = 10. a. if you select a random sample of n = 4 scores from this population, how much error would you expect between the sample mean and the population mean? b. if you select a random sample of n = 25 scores from this population, how much error would you expect between the sample mean and the population mean? c. how much error would you expect for a sample of n = 100 scores?
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Mathematics, 26.07.2019 01:20, savannahsims5847
In the population, “intelligence quotient” scores (iq’s) are approximately normally distributed with a mean of 100 and a standard deviation of 15. suppose we plan to obtain iq scores of a random sample of n = 30 individuals, and then we’ll compute the sample mean and sample standard deviation. suppose you were unsure of the value of the population standard deviation, and so you plan to use only the sample standard deviation. find the exact probability that the sample mean will be within one-third of one sample standard deviation of the population mean.
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Mathematics, 12.09.2019 19:20, Joshghopper
We suspect that, on average, students will score higher on their second attempt at the sat mathematics exam than their first attempt. here are the results for 46 randomly chosen high school students: -0|176655 -0|144422 0l11222333 0|1555666789 1|100223 1. should we use a z-test or a t-test on this data? why? a. a z-test because the population standard deviation is unknown, but we have the data to calculate the sample standard deviation b. a z-test because we know the value of the population standard deviation c. a t-test because the population standard deviation is unknown, but we have the data to calculate the sample standard deviation d. a t-test because we know the value of the population standard deviation 2. can we say that the condition of "normality of the population" is met? why or why not? a. yes, because the plot has no extreme outliers b. no, because the sample size is too small to apply the central limit theorem c. yes, because the population of change in scores in normal d. no, because we do not know if the population of change in scores is normal
Answers: 3
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Mathematics, 30.10.2019 19:31, XxXisaiahXxX
Arandom sample of size n = 10 is taken from a large population. let µ be the unknown population mean. a test is planned of h0 : µ = 12 vs. ha : µ 6= 12 using α = 0.1. a qq plot indicates it it is reasonable to assume a normal population. from the sample, ¯x = 14.2 and s = 4.88. (i suggest doing this problem with a calculator and table as practice for exams. you may check your answers with r if you ) since the data leave it plausible that the population is normal, and the population standard deviation σ is unknown, a t-test is appropriate. compute the p-value of the test. do you reject or not reject h0?
Answers: 3
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