Total Quality Management

231. Two events, A and B, are said to be independent if:

  1. P(A ∩ B) = P(A).P(B)
  2. P(A ∩ B) = P(A) + P(B)
  3. P(A | B) = P(B)
  4. P(B | A) = P(A)
Correct answer: (A)
P(A ∩ B) = P(A).P(B)

232. The value of E[X] is:

  1. 52/18
  2. 28/9
  3. 52/9
  4. 28/18
Correct answer: (C)
52/9

233. A null hypothesis is rejected if the value of a test statistic lies in the:

  1. Rejection region
  2. Acceptance region
  3. Both (a) and (b)
  4. Neither (a) nor (b)
Correct answer: (A)
Rejection region

234. The chi-square goodness-of-fit test can be used to test for:

  1. significance of sample statistics
  2. difference between population means
  3. normality
  4. probability
Correct answer: (C)
normality

235. What do ANOVA calculate?

  1. Z-scores
  2. F ratios
  3. Chi square
  4. T-scores
Correct answer: (B)
F ratios

236. To determine whether the test statistic of ANOVA is statistically significant, it can be compared to a critical value. What two pieces of information are needed to determine the critical value?

  1. Sample size, number of groups
  2. Mean, sample standard deviation
  3. Expected frequency, obtained frequency
  4. MSTR The treatment mean square (MSTR), Mean Square Error (MSE)
Correct answer: (A)
Sample size, number of groups

237. In a study, subjects are randomly assigned to one of three groups: control, experimental A, or experimental B. After treatment, the mean scores for the three groups are compared. The appropriate statistical test for comparing these means is:

  1. the correlation coefficient
  2. chi square
  3. the t-test
  4. the analysis of variance
Correct answer: (D)
the analysis of variance

238. If the F-Value calculated from the data is 0.9, the result is statistically significant

  1. Always
  2. Sometimes
  3. Never
  4. Illogical Question
Correct answer: (C)
Never

239. Which statement is true of an experiment of factorial design?

  1. Independence or orthogonality is unaffected by the sizes of the participant samples in the various treatment combinations.
  2. There are always at least two control groups.
  3. Control over an independent variable is achieved by orthogonal variation with respect to the other independent variables.
  4. There is always a single control group.
Correct answer: (C)
Control over an independent variable is achieved by orthogonal variation with respect to the other independent variables.

240. What would the levels of the independent variables be for a two-way ANOVA investigating the effect of four different treatments for depression and gender?

  1. 4 and 1
  2. 2
  3. 4 and 2
  4. 6
Correct answer: (C)
4 and 2
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