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Suppose that a financial analyst wants to evaluate the variability of the prices of a new stock in the market. The analyst collects closing stock prices of new stock issues: 15, 14, 19, 16, 11, 14, 10, and 9.
a. Compute the mean price of the stock
b. What is the median price?
c. Compute the variance and standard deviation
d. Describe the variability of the stock.
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
For a sample of 138 independent observations from a normal distribution of unknown μ and variance σ 2 = 2.6, the sample mean is 52.3. What is the width of the 95% confidence interval for μ?
They estimated the proportion of students at the university who prefer outdoor exercise as (0.5745, 0.8217), with 95% confidence. Which of the following is an appropriate interpretation of this confidence interval?
How would the results of this survey be used in the workplace? Briefly describe correlational research. Name a variable from this study and one from the workplace that might prove to provide a correlational relationship.
Formulate and present the rationale for a hypothesis test that Par could use to compare the driving distances of the current and new golf balls.
IQ scores but have been standardized so that complete sample has mean of M = 10 and standard deviation of s = 2. Compute mean and the standard deviation for the sample of n = 8 females and for sample of n = 8 males.
State the null and alternative hypotheses. Using the test statistic, degrees of freedom and p-value, what can you conclude about the null hypothesis? What is the 95% confidence interval of the difference? Interpret the 95% confidence interval using t..
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
Using the z table in Table E of Appendix C, determine the critical value for the hightailed test with a = 0.035.
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
In a study, 37% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people living close to a nuclear power plant.
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