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sesenic [268]
3 years ago
15

The quotient of a number X and 2 is 20

Mathematics
1 answer:
pychu [463]3 years ago
8 0
X=10 because 10x2=20
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The management of a department store is interested in estimating the difference between the mean credit purchases of customers u
Mkey [24]

Answer:

Step-by-step explanation:

1) Point estimate is the difference between the sample means. Therefore,

A point estimate for the difference between the mean purchases of the users of the two credit cards is = 140 - 125 = $15

2) Margin of error = z√(σ²/n1 + σ2²/n2)

Where

z is the z score from the 95% confidence level. From the normal distribution table, z = 1.96

s1 and s2 are standard deviation for both customers respectively.

Standard deviation = √variance

σ1 = √100 = 10

σ2 = √641 = 25.32

Margin of error = 1.96√(10²/64 + 25.32²/49 = 7.5

At 95% confidence, the margin of error is 7.5

3) The confidence interval for the difference of two population means is expressed as point estimate ± margin of error

Confidence interval = 15 ± 7.5

The upper boundary for the confidence interval is

15 - 7.5 = 7.5

The lower boundary for the confidence interval is

15 + 7.5 = 22.5

A 95% confidence interval estimate for the difference between the average purchases of the customers using the two different credit cards is $7.5 to $22.5

4) Since the population standard deviations are known, we would use the formula to determine the test statistic(z score)

z = (x1 - x2)/(√σ1²/n2 + σ2²/n2)

z = (140 - 125)/√10²/64 + 25.32²/49

z = 1.02

The test statistic for an alpha of .05 is 1.02

4 0
3 years ago
Pls answer this question with complete answers thank u❤️❤️❤️
MAVERICK [17]
Yes Clare should switch because $96 + 12% is $107.52 but if she get the other one, it would be $105 in one year because $8.75 x 12 is $105
5 0
2 years ago
Read 2 more answers
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Answer:

-6x-12 /-2x^2+x^3

Step-by-step explanation:

this question was on my math test

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3 years ago
Solve the following inequalities (picture attached)
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34.
(a) A. x < 4
(b) p > 1
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I love solving inequalities. I hope you find this answer the most helpful! :)</span>
6 0
3 years ago
which of the following is the best definition of “social justice”? the idea that the law is sacred and always applies to everyon
gulaghasi [49]
Social justice can be defined as the idea that the law is sacred and always applies to everyone in the exact way.
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