011 2011 1. A standard normal distribution has the mean equal---and variance--:

Question

011 2011 1. A standard normal distribution has the mean equal---and variance--: a. 0,1 marks, Mark Each) Part-II (Multiple Choice Ouestions MC Answers c. Either a or b d. None 2, 10% of college students are left-handed. For a statistics class of 35 students, find the mean number of left-handed students. b. 3.15 d. None of the above Section nswer the following Essa e Questions (18 marks, 6 Mark Each) Question 1: a. A bank vice president feels that each savings account customer has, on average, 3 credit cards. The following distribution represents the number of credit cards people own. Find the mean, variance, a 3. If the sampling crror (E) is allowed to incrcase, which of the following is true regarding the sample size? nd standard deviati on a. The sample size ll increase Number of 01 cards x b. The sample size will decrease c. The sample size will stay the same d. The sample size cannot be determined Probability 4. If each of a set of raw scores is transformed into a Z-score, the new distribution will have a standard deviation equal to a. zero b. one c. the mean of the original distribution. d. the standard deviation of the original distribution. 0.18 0.44 0.27 0.080 0.03 b. The Bruskin Market Research, Inc. determined that 40% of college students work part-time during the academic year. For a random sample of 5 students, what is the probability that 1) at most 3 work part-time? 2) at least 2 work part-time? 3) fewer than 3 work part-time? 5. The i distribution has- degrees of freedom. Qnestion 2: in b. 2 c. 10 a) Piz -1.88) c) PI-1.18

Explanation / Answer

Solution:-

1. option a. 0,1

Explanation:- The standard normal distribution is defined as a normal distribution with a mean of 0 and a standard deviation of 1.

2. option a. 3.5

Explanation:- np = 35*0.1 = 3.5

3. option b. The sample size will decrease.

Explanation:-  If error increases, a smaller sample can be used.

4. option b. one

Explanation:- Z-score = (X - MU)/SIGMA

5. option d. n - 1

6. option d. 30.1

Explanation:-  => using the equation x = mean+z(sd) = 25+1.7(3) 30.1

Section - 1

1- Flase

Explanation:-  6C3(1/2)^3

2 - True

3 - True

4 - True

5 - True

6 - Flase

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