A teacher needs to estimate the population mean test score.
Estimate the population mean test score using the following sample:
x=59,90,82,76,83 alpha=.01
point estimate________________ Bound____________________
critical value_________________ Low estimate_________________
standard error________________ High estimate_________________
A teacher needs to estimate the population mean test score. Estimate the population mean test score...
(1 point) Test the claim that for the population of statistics final exams, the mean score is 78 using alternative hypothesis that the mean score is different from 78. Sample statistics include n = 23, x = 80, and s = 11. Use a significance level of a = 0.05. (Assume normally distributed population.) The test statistic is The positive critical value is The negative critical value is The conclusion is A. There is not sufficient evidence to reject the...
A researcher wants to estimate the mean IQ score for a population of high school students. How many students will she have to select for the IQ tests if she wants 95% confidence the sample mean is within 3 IQ points of the population mean? Assume the population standard deviation is 15.
Pat needs to conduct a z-test on the mean of a sample. He believes the population mean is 12 and he wants to make sure his test will have a power of at least 0.9 if the true population mean is less than 10 or greater than 14. How can he make sure his test will be adequate? He must ensure that his sample size is greater than 40 He must adjust the alpha value of the test He must...
You administered a survey to a sample of 401 high school sophomores and found a mean narcissism score of 91.3 with a standard deviation of 10. However, a recent study of high school seniors found that the average narcissism score was 92. Based on this prior research, test the null hypothesis that your sample of high school sophomores came from a population of high school sophomores in which the mean narcissism score is 92 against the alternative hypothesis that your...
A teacher claims that the mean score on a statistics test is 81 points. A random sample of 64 test scores yields a mean score of 79 points and a standard deviation of 10 points. Use a significance level of 0.05. a. State the null and alternative hypotheses. b. Construct a statistic to test the hypotheses and select the distribution to use. c. Find the P-value, and determine the level of significance. d. Make the decision and interpret
An IQ test is designed so that the mean is 100 and the standard deviation is 13 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 4 IQ points of the true mean. Assume that σ=13 and determine the required sample size using technology. Then determine if this is a reasonable sample size for...
4. You want to estimate the mean SATM score for 250,000 high school seniors in California. Only about 45% of California students take the SAT. These self-selected students are planning to attend college and are not representative of all California seniors A simple random sample (SRS) of 500 California high school seniors is tested. The mean score of the sample is Y 461. What could you say about the mean score, n-508 in the population of all 250,000 seniors? Assume...
The purpose of this question is to help you understand how to estimate the population mean on the basis of just having information from a sample. For the following cases, calculate a rough estimate of the population mean, given the sample mean and the standard error of the mean: a X= 100, standard error of the mean = 5, 95% confidence level (p <.05) b. X= 100, standard error of the mean = 2, 95% confidence level (p<.05) c. X...
8. If the population of interest has µ = 60 and σ = 40 and we draw a sample of 64 people with M = 72, what would be the Power for a two-tailed test with alpha = .05? Report the standard error Report the critical value for the null distribution Report the sample mean value that corresponds to the critical value from part b) and its z-score for the alternative distribution Report the Power Report the probability of making...
3 Lately, Jude has been feeling a little sad and depressed. He suspects he has been listening to too many sad songs in his extensive iTunes collection. Jude takes a random sample from his thousands of downloaded tunes and classifies ech song as 'Sad' or Not Sad Estimate the population proportion of sad songs in Jude's collection using the following sample. Sad 160 Not Sad 40 Level of Confidence-99% Sploynit (written interpretation) Point Estimate - Critical Value Standard Errors Bound...