Questions from Business Statistics

Q: A null hypothesis must always include the equality sign. 2

A null hypothesis must always include the equality sign. 2. If the result of a hypothesis test is statistically significant, it must be considered a substantive result. 3. The null hypothesis is rejec...

Q: What is the relative frequency of type B in the previous question

What is the relative frequency of type B in the previous question? a) 0.25 b) 0.35 c) 0.5 d) 0.64 29. In sciences and technology, use of pie charts is limited compared to other types of graphs such as...

Q: To test if the means of two populations are different, we

To test if the means of two populations are different, we test the significance of the difference between two sample means. 2. The distribution of the difference between two sample means may be consid...

Q: In a one-way ANOVA the total variance is portioned into

In a one-way ANOVA the total variance is portioned into the variance due to treatments and the variance due to error. 2. A repeated measures design is a special case of the randomized block design.

Q: Chi-square goodness-of-fit tests are always one

Chi-square goodness-of-fit tests are always one-tailed tests. 2. A chi-square goodness-of-fit test can be used as an alternative to z-test for population proportions if there are only two classificati...

Q: Reengineering is the approach to revise or redo the engineering design of

Reengineering is the approach to revise or redo the engineering design of a product in response to customer complaints.

Q: The payoffs of a decision analysis problem are the payments to decision

The payoffs of a decision analysis problem are the payments to decision makers. 2. When it is uncertain which of the states of nature will occur and also the probability of each state of nature occurr...

Q: Which of the following descriptive measure is not a statistic?

Which of the following descriptive measure is not a statistic? a) Sample mean b) Population mean µ c) Sample standard deviation s d) Sample variance s2 e) Sample median 5. To study the i...

Q: The heights of four fifth grade students are 58, 56,

The heights of four fifth grade students are 58, 56, 60 and 62 inches. What are the mean, median and standard deviation of this dataset, and the standard deviation of the new dataset by adding 2 to ea...

Q: For a skewed distribution, what is the minimum percentage of the

For a skewed distribution, what is the minimum percentage of the observations that will lie within 2 standard deviations of the mean based on Chebyshev’s rule? a) 68% b) 75% c) 95% d) 99.7% 16. For a...