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Natasha_Volkova [10]
3 years ago
11

Please help 15 points!

Mathematics
1 answer:
tigry1 [53]3 years ago
6 0

Answer:

EEE I KNOW. Its C

Step-by-step explanation:

(Im not guessing i actually solved these its C)

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Which words name the shape ?
Montano1993 [528]

Answer:

D

Step-by-step explanation:

It's these shapes because:

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In a random sample of 1066 U.S. adults, 580 think that the U.S. government
alexandr402 [8]

Answer:

Step-by-step explanation:

This is a test of 2 population proportions. Let 1 and 2 be the subscript for the adults who think that the U.S. government is doing too little to protect the environment presently and the adults who think that the U.S. government is doing too little to protect the environment 10 years ago. The population proportions would be p1 and p2 respectively.

p1 - p2 = difference in the proportion of adults who think that the U.S. government is doing too little to protect the environment presently and the adults who think that the U.S. government is doing too little to protect the environment 10 years ago.

The null hypothesis is

H0 : p1 = p2

p1 - p2 = 0

The alternative hypothesis is

Ha : p1 ≠ p2

p1 - p2 ≠ 0

it is a two tailed test

Sample proportion = x/n

Where

x represents number of success

n represents number of samples

For the present,

x1 = 580

n1 = 1066

p1 = 580/1066 = 0.54

For 10 years ago,

x2 = 514

n2 = 1038

P2 = 514/1038 = 0.5

The pooled proportion, pc is

pc = (x1 + x2)/(n1 + n2)

pc = (580 + 514)/(1066 + 1038) = 0.52

1 - pc = 1 - 0.52 = 0.48

z = (p1 - p2)/√pc(1 - pc)(1/n1 + 1/n2)

z = (0.54 - 0.5)/√(0.52)(0.48)(1/1066 + 1/1038) = 0.04/0.02178551744

z = 1.84

Since it is a two tailed test, the curve is symmetrical. We will look at the area in both tails. Since it is showing in one tail only, we would double the area

From the normal distribution table, the area above the test z score in the right tail 1 - 0.967 = 0.033

We would double this area to include the area in the left tail of z = - 1.84 Thus

p = 0.033 × 2 = 0.066

Alpha = 0.1

Since alpha, 0.1 > p value 0.066, we would reject the null hypothesis.

Therefore, at a = 0.10, we can reject the

claim that the proportion of U.S. adults who think that the U.S. government

is doing too little to protect the environment has not changed.

4 0
3 years ago
A citrus grower anticipates a profit of $100,000 this year if the nightly temperatures remain mild. Unfortunately, the weather f
Alchen [17]

Answer:

The grower should spend the $5,000, thereby reducing the profit to $95,000.

But, this is based on a 20% probability of freezing temperature during the next week.

Step-by-step explanation:

A) If freezing weather happens with a 20% chance, the profit will be reduced to $60,000.

With this probability, the probable loss will be 20% X $40,000 = $8,000.

B) If the grower can protect the fruit against freezing weather at a cost of $5,000, then she should go ahead.  Doing this, the profit will be reduced to $95,000 because of the cost.

However, it is worthy to note that freezing weather happens at 20% chance.  This implies that the freezing weather might not happen, 80% chance.  But, prudence still demands that necessary precautions are taken, and this includes protecting the crop at a cost of $5,000.

4 0
3 years ago
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