State whether the following statements are True or False. (6 marks, 1 Mark Each)

Question

State whether the following statements are True or False. (6 marks, 1 Mark Each)

1-A fair coin is tossed 6 times. The probability of it lands tails up exactly 3 times is 10× (   

2-A frequency distribution groups data into classes showing the number of observations in each class.

3-If probability sampling is done, each item in the population has a chance of being chosen.    

4-A critical value is a Z-score separating unlikely value from those that are likely to occur.

5-A point estimate is a single value or point used to approximate a population parameter.

6-The number of women taller than 68 inches in a random sample of 5    women is an example of the continuous random variable.

Explanation / Answer

1.

6C3(1/2)^6 = 20*0.015625 = 0.3125

2.

True.

3. A probability sampling method is any method of sampling that utilizes some form of random selection. In order to have a random selection method, you must set up some process or procedure that assures that the different units in your population have equal probabilities of being chosen.

True

4. True.

5. True.

6. False. This is an example of binomial random variable.

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