One survey showed that among 785 randomly selected subjects who completed four years of college, 18.3% smoke and a 98% confidence interval for the true percentage of smokers among all people who completed four years of college is 15.1% to 21.6%. Based on the result, the smoking rate for those with four years of college appears to be substantially different than the 27% rate for the general population.a. Trueb. False

Answers

Answer 1

Answer:

Answer

a. True

Step-by-step explanation:

Based on this survey we estimate that about $18.3\%$ of the college students smokes. And a $98\%$ confidence interval is $[15.1\% ; 21.6\%]$ . So we know that our estimative for the smoking rate is in the confidence interval with $98\%$ certainty. We also know the estimative for the smoking rate in the general population is $27\%$ . So we can write the two possible hypothesis:

$H_0 =$ Smoking rate is equal to $27\%$ .

$H_1 =$ Smoking rate is not equal to $27\%$ .

We will reject the null hypothesis $(H_0)$ if the estimate doesn't fall into the confidence interval for the college students smoking rate.

Since this condition holds we reject the null hypothesis. So with $98\%$ certainty we say that the smoking rate for the general population is different than the smoking rate for the college students.

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Rebecca buys some socks that cost $5.87 per pair and a t-shirt that cost $12.99. The cost of Rebecca’s total purchase is $87. What equation can be used to find n, the number of socks she purchased?

Answers

Answer:

$5.87n + 12.99 = 87$

angel has a total of 97 dimes and nickels. if the total value of the coins is $8.35, how many dimes does he have

Answers

dime=10 cents
nickles=5 cents

835=10d+5n
divide both sides by 5
167=2d+n

total number of coins is 97
97=d+n

we have

2d+n=167
d+n=97
multiply 2nd equation by -1 and add them

2d+n=167
-d-n=97 +
1d+0n=70

d=70

sub back

d+n=97
70+n=97
minus 70 both sides
n=27

70 dimes

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When flying from Florida to the Philippines island why does the shortest route pass through Alaska?

Answers

Because the earth is round, the distance seen on a flat map is a lot further than the distance on a globe, because of distortion. So following the circle that goes through these 3 points ( Florida, Alaska and the Philippines) it is a shorter distance to fly over Alaska.

Holly finds that (11m – 13n + 6mn) – (10m – 7n + 3mn) = m – 20n + 9mn. What error did Holly make? a)he only used the additive inverse of 10m when combining like terms. b)She added the polynomials instead of subtracting. c)She only used the additive inverses of –7n and 3mn when combining like terms. d) She did not combine all like terms.

Answers

Answer:

a) She only used the additive inverse of 10m when combining like terms.

Step-by-step explanation:

Given : Holly finds that $(11m-13n+6mn)-(10m-7n+3mn)=m-20n+9mn$

First we open the bracket by multiplying minus sign in it, we get

$11m-13n+6mn-10m+7n-3mn$

Combining like terms we get, we get

$11m-10m-13n+7n+6mn-3mn=m-6n+3mn$ → correct answer.

When we compare the correct answer to the answer given by Holly, the first term is same in both the answers,

Therefore, She only used the additive inverse of 10m when combining like terms.

Answer:

answer A

Step-by-step explanation:

Find the unit rate, and then use it to solve the problem. A trucking company makes 50 deliveries in 5 days.

How long will it take for 400 deliveries?

A.
8 days

B.
10 days

C.
20 days

D.
40 days

Answers

If the company makes 50 deliveries in 5 days, he makes 50/5=10 deliveries per day. Therefore, 400 deliveries will take 400/10=40 days. D is the correct answer.

Find p in this equation:
2^3=4^p

Answers

Answer:

p = 3/2

Step-by-step explanation:

2^3 = 4^p

Apply exponent rules:

3 = 2p

Divide 2 from both sides:

3/2 = p

p = 3/2

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