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Indicate which of the following situations involve descriptive statistics and which involve inferential statistics:
a. An annual stockholders' report details the assets of the corporation.
b. A history instructor tells his class the number of students who received an A on a recent exam.
c. The mean of a sample set of scores is calculated to characterize the sample.
d. The sample data from a poll are used to estimate the opinion of the population.
e. A correlational study is conducted on a sample to determine whether educational level and income in the population are related.
f. A newspaper article reports the average salaries of federal employees from data collected on all federal employee
What is the importance of hypothesis testing for independence of variables using two-way tables? Is there an example of this for a better understanding?
question consider the nypd case. assume the managers decide to devise a performance metric that considers the i
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the standard deviation for the sample proportion?
Comparative Advantage a. Explain how the theory of comparative advantage relates to the need for international business.
The hypotheses are as follows: Null Hypothesis: μD ≤ 0, Alternative Hypothesis: μD > 0. From her data, the resesarcher calculates a p-value of 0.0162. What is the appropriate conclusion? The difference was calucated as (after - before).
At 95% confidence using the p- value approach, test the hypotheses. Let α = 0.1.
1. compute the percentage of the normal curve located at or above each of the following z values.a. 1.50b. -1.50c.
Using the 50%-34%-14% figures, approximately what percentage of people have a score a) above 40 b) above 45 c) above 30 d) below 45 g) below 30.
suppose that 84 of hypertensives and 23 of normotensives are classified as hypertensive by an automated blood-pressure
a set of test scores is normally distributed with a mean of 100 and a standard deviation of 15. if cases are drawn
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