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maw [93]
2 years ago
8

Yes I know it’s to much but pleaseee...it’s due at 11 :(

Mathematics
1 answer:
Maurinko [17]2 years ago
8 0
Same I don’t know , you can go online and pay someone to do it for you

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slava [35]
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3 0
3 years ago
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
Eve has 17,493 pony beads, 14,07 pearl beads, 8,037 shell beads, and 6,834 bugle beads. Yvette has 294,972 more beads than Eve.
Alex_Xolod [135]
The answer is 325743 please mark branliest  and give thanks if not i will report u
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Bre will receive one of the following 3 prizes: a boombox, a mini tv, or a sony playstation. which simulation would best be used
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Answer:

b pick 3 marbles form a bag of 10 different colored marbles

Step-by-step explanation:

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3 years ago
Will some one please help me asap
olya-2409 [2.1K]
Formula: Circumference = πD

Given that diameter = 42,
 
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Answer: 132 ft
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3 years ago
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