Analyze test

Question 1

T/F A multi-vari chart can be used to explain whether any two categorical factors have an interaction.

Answer 1

TRUE

Question 2

Which one of the following is an example of the temporal (over time) source of variation?

WORK SHIFT
CONSECUTIVE BATCHES
SINGLE UNIT
CONSECUTIVE UNITS

Answer 2

WORK SHIFT

Question 3

Which one of the following can be accommodated statistically?

SAMPLING ERROR
MEASUREMENT ERROR
SAMPLING BIAS
LACK OF MEASUREMENT VALIDITY

Answer 3

SAMPLING ERROR

Question 4

T/F An alpha risk is the probability of wrongly accepting the null hypothesis.

Answer 4

FALSE

Question 5

What are the two types of significant differences?

Answer 5

PRACTICAL AND STATISICAL

Question 6

A hypothesis test:

Answer 6

A hypothesis test is based on knowledge that comes before the facts (a priori theory) to determine if the null hypothesis can be accepted and used to define the problem statistically.

Question 7

If the p-value is greater than 0.05, then there is not enough evidence to accept the null hypothesis.

Answer 7

FALSE

the p-value is greater than 0.05, then there is not enough evidence to reject the null hypothesis.

Question 8

Which distribution is used to estimate the p-value and confidence interval for a 1-sample variance test if data are normal?

Answer 8

CHI-SQUARE
Chi-square distribution is used for a 1-sample variance test and F-distribution is used for a 2-sample variance test for normal data. Binomial distribution is usually used for 1- and 2-sample proportion tests. Z-distribution is used for a 1-sample Z-test of mean and when data are considered normal.

Question 9

In a one-way ANOVA test, within variation is the:

Answer 9

variation within each sample group.

In a 1-way ANOVA test, variations within each sample group and between sample groups are analyzed.

Question 10

T/F One-way ANOVA extends the paired t-test for testing the equality of more than two population means.

Answer 10

FALSE

One-way ANOVA extends the 2-sample t-test for testing the equality of more than two population means.

Question 11

T/F The 1-sample Wilcoxon test is an alternative to the paired t-test.

Answer 11

TRUE
The 1-sample Wilcoxon test is used to compare two related samples or matched samples to assess whether their median of pairwise averages of differences is zero.

Question 12

Contingency tables are used to simultaneously compare more than two sample ____________ with each other .

Answer 12

PROPORTIONS

Contingency tables are used to simultaneously compare more than two sample proportions with each other.

Question 13

Fifty students of a higher secondary school were tested in the English language for vocabulary, grammar, and reading comprehension separately. The Friedman test was used to determine whether students performed equally in all tests. What is the block in the above study?

Answer 13

Each student represents a block of data and each test type is considered as a treatment.

Question 14

T/F If data comes from multiple sources that are supposed to be the same yet are not, it will form a normal distribution.

Answer 14

FALSE A mixed distribution occurs when data comes from multiple sources that are supposed to be the same yet are not.

Question 15

Inferential statistics is used to draw conclusions about ______________ characteristics from information contained in a sample drawn from the ___________, considering randomness and uncertainty in the data collection

Answer 15

Inference is about the population using the sample data collection from the same population. Sample data should be representative of the population.

Question 16

Central limit theorem states that if the population is____________, the sampling distribution of means will be normal when the sample size is large (n > 30).

Answer 16

NON-NORMAL
The central limit theorem states that the sampling distribution of means (of multiple samples taken from the population) tends to be normal when the sample size is large.

Question 17

T/F The Mann-Whitney test determines whether the means of two populations are different.

Answer 17

FALSE

he Mann-Whitney test is used to determine whether the medians of two populations are different.

Question 18

T/F A Belt analyzed the rejected data of Process A and Process B using a 2-sample proportion test. She concluded (based on p-value = 0.400) that Process B has better quality than Process A.

Answer 18

The lower average customer service time is better. The null hypothesis statement is “both average customer service times are the same.” The alternate hypothesis statement is “the average customer service time of call center A is less than that of call center B.”

Question 19

A 1-sample sign test assigns positive and negatives signs for the observations above and below the target (median). What is the null hypothesis statement?
A
The number of positive signs is equal to the number of negative signs.
B
The number of positive signs is greater than the number of negative signs.
C
The number of positive signs is less than the number of negative signs.
D
None of the above

Answer 19

The number of positive signs is equal to the number of negative signs.

The target (median) is the center of the data. Therefore, the null hypothesis statement can be “the number of observations above the target is equal to the number of observations below the target.”

Question 20

In the Kruskal-Wallis test, ____________ distribution is used to estimate the probability value.

Poisson
B
binomial
C
chi-square
D
normal

Answer 20

The chi-square distribution approximates the distribution of the Kruskal-Wallis test statistic if no group has fewer than five observations.