STA301 QUIZ NO 3 SOLVED SPRING 2019 FILE 2|| 100% VERIFIED|| VURANK

STA301 QUIZ NO 3 SOLVED 100% VERIFIED BY ADMIN (FINAL TERM SYLLABUS)

Q1: Which one of the statement is true?

A) E(S2) = s2/n

B) E(s2) = σ2/n

C) E(s2) = σ2 (100% Sure)

D) E(S2) ≠ s2

Q2: P 0 1/3 2/3 1
f(p) 1/20 9/20 9/20 1/20
The mean of the sampling proportion will be:

A) 9/20

B) 10/20 (100% Sure)

C) 11/20

D) 12/20

Q3: As sample size goes up, what tends to happen to 95% confidence intervals?

A) They become wider

B) They become moer precise

C) They become more narrow

D) They become more precise and narrow (100% Sure)

Q4: β is the probability of:

A) Accept H0|H0 is false (100% Sure)

B) Reject H0|H0 is true

C) Accept H0|H0 is true

D) Reject H0|H0 is false

Q5: "A point estimate plus/minus a few times the standard error of that estimate". This statement represents:

A) Confidence intervals (100% Sure)

B) Critical region

C) Acceptance region

D) Critical value

Q6: The mean of the sampling distribution of x1̄ - x2̄ denoted by μx1̄ - μx2̄ is equal to the difference between respective

A) Sample Means (100% Sure)

B) Population Means

C) Sample Proportions

D) Population Proportions

Q7: The t-test for independent samples assumes which of the following?

A) Scores are independent

B) Scores are dependent

C) Groups have equal means (100% Sure)

D) Groups have equal medians

Q8: The precision of an estimator can be increased by decreasing the:

A) Level of significance (100% Sure)

B) Number of parameters

C) Number of estimators

D) Size of sample

Q9: Three unbaised coins are tossed. The sample space is: S = {TTT,TTH,THT,HTT,THH,HTH,HHH}. What is the probability of getting at most two heads?

A) 1/4

B) 3/1

C) 1/2 (100% Sure)

D) 7/8

Q10: From the following table, x 0 1 2 3 f(x) 0.26 0.49 0.22 0.02 E(2X+1) will be:

A) 2

B) 1.98

C) 2.98 (100% Sure)

D) 0.99