Stats doubts

[Homer Simpson]

1) Five hundred (500) random samples of size n=900 are taken from a large population in which 10% are
left-handed. The proportion of the sample that is left-handed is found for each sample and a histogram
of these 500 proportions is drawn. Which interval covers the range into which about 68% of the
values in the histogram will fall?

A. .1 ± .010
B. .1 ± .0134
C. .1 ± .0167
D. .1 ± .020

2) Which of the following is the most common example of a situation for which the main parameter of interest is a population proportion?

A. A binomial experiment
B. A normal experiment
C. A randomized experiment
D. An observational study

whats population proportion???

3) If two events (both with probability greater than 0) are mutually exclusive, then:

A. They also must be independent.
B. They also could be independent.
C. They cannot be independent.

[The Villain]

quest 3 is c

[The Villain]

Quest 2 is a...binomial..where we write it as p=X/n

[Homer Simpson]

thank you Ron. for the 3rd question, if say the events are independent, then are they always or sometimes mutually exclusive?

[The Villain]

Never...it apllies vice versa too

[Shefali]

yeah quest 2 is binomial

[Noel]

You could use the 68-95-99.7 rule for normal distribution to solve the first question which says that 68% of the values lie in the interval

mean + - standard deviation