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tangare [24]
3 years ago
15

While he hikes in the Gold Country of northern California, Sid dreams about the adventurers that walked the same trails years ag

o. He suddenly kicks a small bright yellowish nugget. Could it be gold? Sid quickly makes a balance scale using his walking stick and finds that the nugget has the same mass as the uneaten half of his 330 g nutrition bar. He then drops the stone into his water bottle, which has a 2.5 cm radius, and notes that the water level goes up 0.9 cm. Has Sid struck gold? Explain your reasoning. (Refer to the density chart in
Mathematics
1 answer:
olga2289 [7]3 years ago
5 0
I did. Undestand the probelm
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Paul owns a mobile wood-fired pizza oven operation. A couple of his clients complained about his dough at a recent catering, so
Makovka662 [10]

Answer: B. Do not reject H0, we cannot conclude the proportion of customer complaints is more for the old dough

Step-by-step explanation:

This is a test of 2 population proportions. Let 1 and 2 be the subscript for the old and the new dough players. The population proportions of customer complaints with the old and new dough would be p1 and p2

P1 - P2 = difference in the proportion of customer complaints with the old and new dough.

The null hypothesis is

H0 : p1 ≥ p2

pm - pw ≥ 0

The alternative hypothesis is

Ha : p1 < p2

p1 - p2 < 0

it is a left tailed test

Sample proportion = x/n

Where

x represents number of success(number of complaints)

n represents number of samples

For old dough

x1 = 6

n1 = 385

P1 = 6/385 = 0.016

For new dough,

x2 = 16

n2 = 340

P2 = 16/340 = 0.047

The pooled proportion, pc is

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

pc = (6 + 16)/(385 + 340) = 0.03

1 - pc = 1 - 0.03 = 0.97

z = (Pm - Pw)/√pc(1 - pc)(1/nm + 1/nw)

z = (0.016 - 0.047)/√(0.03)(0.97)(1/385 + 1/340) = - 0.031/√0.00553857907

z = - 0.42

Since it is a left tailed test, we would find the p value for the area to the left of the z score. From the normal distribution table,

p value = 0.337

For a 95% confidence level, the significant level, alpha is

1 - 0.95 = 0.05

Since 0.05 < 0.337, we would accept the null hypothesis

Therefore, Do not reject H0, we cannot conclude the proportion of customer complaints is more for the old dough

7 0
3 years ago
What is 5*5*5*5*5*5*5 in exponential notation form?
slamgirl [31]

Answer:

5⁷

Step-by-step explanation:

5*5*5*5*5*5*5

here,

count how many 5 are there - 7

so,

<u>exponential notation form:</u>

5*5*5*5*5*5*5 = 5⁷

5 0
3 years ago
Read 2 more answers
A shirt originally cost $39.59, but it is on sale for $27.71. What is the percentage decrease of the price of the shirt? If nece
Leokris [45]

Answer:

30 percent less than the original price

3 0
3 years ago
If I go into the store with $26 and I leave and come out with $11.70 how much did I spend​
pogonyaev

Answer:

$14.30

Step-by-step explanation:

26 - 11.70 = 14.30

4 0
2 years ago
Two algebra questions! please help :(
Fiesta28 [93]
The answer is B. h=<span>V<span>2π<span>r<span>2</span></span></span></span>
8 0
3 years ago
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