Dave found that about 8/9 of the students in his class have a cell phone.What percent of the students in his class do NOT HAVE a
1 answer:
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Answer:
Then the minimum sample size in order to satisfy the condition of 0.1 for the margin of error is 97 and since the sample used is n =100 we can conclude that is sufficient and the best answer would be:
D. Yes.
Step-by-step explanation:
In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. We know that we require a 95% of confidence, our significance level would be given by and
. And the critical value would be given by:
The margin of error for the proportion interval is given by this:
(a)
We want a margin of error of and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
Since we don't have prior info for the population proportion we can use as estimator the value of 0.5. And replacing into equation (b) the values from part a we got:
Then the minimum sample size in order to satisfy the condition of 0.1 for the margin of error is 97 and since the sample used is n =100 we can conclude that is sufficient and the best answer would be:
D. Yes.
Answer:
There are 2,598,960 5 draw poker hands are there.
There are 311,875,200 5-stud poker hands.
Step-by-step explanation:
When the order is not important, we use the combinations formula:
For example, eating an apple and an orange is the same as eating an orange and an apple.
is the number of different combinations of x objects from a set of n elements, given by the following formula.
When the order is important, we use the permutations formula:
For example, a 3 digit credit card password, 123 is different than 213.
The number of possible permutations of x elements from a set of n elements is given by the following formula:
A hand of 5-card draw poker is a simple random sample from the standard deck of 52 cards. How many 5 draw poker hands are there?
Here, the ordering is not important, so we use the combinations formula.
There are 2,598,960 5 draw poker hands are there.
In 5-card stud poker, the cards are dealt sequentially and the order of appearance is important. How many 5-stud poker hands are there?
The ordering is important, so we use the combinations formula.
There are 311,875,200 5-stud poker hands.