Suppose an opinion poll predicted that, if the election were held today, the Conservative party would win 68% of the vote. If the pollster attached a 95% confidence level to the interval 68% plus or minus 4%, what would that mean?
A.
That there is a 95% chance that the Conservative party will win between 64% and 72% of the vote.

B.
That there is a 99% chance that the Conservative party will win 68% of the vote.

C.
That there is a 95% chance that the Conservative party will win 4% of the vote.

D.
That there is a 95% chance that the Conservative party will win 68% of the vote.

answer:

The correct answer is:

We can be 95% confident that the true proportion of votes for the Conservative property will fall within 4 points of 68%, or the interval 64% - 72%.

Explanation:

The confidence level (95%) tells us the chance that our interval contains the true proportion.

The margin of error (4%) gives us the interval above and below the mean percentage given.

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answer: 800

step-by-step explanation:

1. sometimes

2.   never

3   .08c = 7.50+.05c   250 pages

step-by-step explanation:

1.   sometimes

the theoretical probability of rolling a 1 is 1/6.   perhaps you got really lucky and never rolled a 1   in those 60 times.   your experimental probability is 0.   or perhaps you rolled a 1   20 times.   your experimental probability is 20/60 is 1/3.     it really just depends on how you rolled in that experiment.

2.   never

the probability of the event occurring is 1.   that is being 100 % sure it will happen.   that is the maximum amount of confidence we have.

3.   no customer card cost:   .08 times number of pages

customer card cost:   7.50 + .05 times number of pages

we want to find when it costs the same amount, so we will set these equal

let c = number of pages

.08c = 7.50+.05c

subtract .05c from each side

.08c-.05c = 7.5+.05c-.05c

.03c=7.5

divide each side by .03

.03c/.03 = 7.5/03

c =250  

the cost is the same at 250 pages