When the subgroup size varies from one sample to another, U-chart is used.

Which of the following statements are true with regards to the selection of a sample size? (i) The sample size (n) may be a fixed percentage of lot size (N). (ii) The sample size (n) may be kept constant irrespective of lot size (N). (iii) Sample size (n) can be selected at the personal whim of the inspector.

A

i only

B

i, ii only

C

i, ii, iii

D

i, iii only

In a test of differences between proportions, two samples are taken. In the first sample, a sample size of 100 shows 25 successes. In the second sample, a sample size of 80 shows 25 successes. What would be the value of B in this case?

A

$$\frac{{30}}{{100}} + \frac{{25}}{{80}}$$

B

$$\frac{{30}}{{100}} \times \frac{{25}}{{80}}$$

C

$$\frac{{30 + 25}}{{100}}$$

D

$$\frac{{30}}{{100}} + \frac{{25}}{{180}}$$

Which of the following statements about reliability of a test are correct? (i) Reliability is fixed for a given test. (ii) It is a correlation of the test with itself. (iii) It varies from sample to sample. (iv) it is not affected by the size of the sample (v) High reliability ensures high validity

A

(i), (iii) and (iv)

B

(ii), (iii) and (v)

C

(i) and (iv)

D

(ii) and (iii)

Calculate the sample size (n) for a lot of 200. Take the sample size as 5% of lot size.

A

20

B

22

C

10

D

15

Which of the following is correct regarding the Charpy toughness test: P. The sample is held vertically as cantilever beam. Q. The sample is held horizontally as simply supported beam. R. The Notch in the sample faces the striking hammer. S. The Notch in the sample is opposite to the striking hammer.

A

P, R

B

P, S

C

Q, R

D

Q, S

A student was studying primate uterine thickness. She had 3 samples of uterine tissues. The thickness in mm for the samples are as follows: Sample A – 4 mm, Sample B – 10 mm, Sample C – 1 mm Given the knowledge of menstrual cycle in humans, what phases do you think each sample belongs to?

A

Sample A: Menstrual phase, Sample B: Follicular phase, Sample C: Luteal phase

B

Sample A: Proliferative phase, Sample B: Luteal phase, Sample C: Menstrual phase

C

Sample A: Secretory phase, Sample B: Menstrual phase, Sample C: Proliferative phase

D

Sample A: Menstrual phase, Sample B: Secretory phase, Sample C: Follicular phase

A researcher conduct a hypothesis test and observes values from sample mean and sample standard deviation when n = 25, that do not lead to rejection of null hypothesis. He calculates the p value as 0.0667. What will happen to the p value if he observes the same sample mean and standard deviation for a sample > 25?

A

Stay the same

B

Increase

C

Decrease

D

May increase or decrease

Let K be a group with 8 elements. Let H be a subgroup of K and H

List I List II Sampling techniques used in research Description A. Simple random sampling I. The units are identified in terms of various specific features identified before drawing a sample structure B. Systematic sampling II. Each unit is given an equal independent chance of being picked up C. Dimensional sampling III. The k – interval is obtained by N/n and the units are drawn using the same, where N is population size and n is desired sample size. D. Snowball sampling IV. First member unit is used to identify the second unit and so on Choose the correct answer from the options given below:

A

A - I, B - IV, C - II, D - III

B

A - II, B - III, C - I, D - IV

C

A - IV, B - II, C - III, D - I

D

A - III, B - I, C - IV, D - II

The sample for the control chart for nonconformities is assumed to have, a variable sample size, and the sample conformities distributed according to Normal distribution.

A

True

B

False

When the subgroup size varies from one sample to another, U-chart is used.

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