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ANEK [815]
2 years ago
8

A bank wants to estimate the difference in the proportion of its "big" customers who have a second account with a different bank

and the proportion of its "small" customers who also have an account with another bank. Of the 200 "big" customers randomly selected, 160 claimed to also bank elsewhere. Of the 300 "small" customers randomly selected, 120 claimed to also bank with other banks. Check the conditions for constructing a confidence interval for the difference in proportions.
Mathematics
1 answer:
In-s [12.5K]2 years ago
5 0

Answer:

Kindly check explanation

Step-by-step explanation:

To construct confidence interval for difference in proportion ; the following conditions must be met :

1.) The selected samples must have been randomly chosen or selected from a larger population. This is essential in other to eliminate bias.

Each group of samples must be independently chosen. That is, the samples of bug customers chosen must be independent of the sample of small customers selected.

The population from which the samples are drawn must be considerably larger than the sample size. Sample size, n should be ≤ 10% of the population size.

p1 = 160 / 200 = 0.8 ; (1 - p1) = 0.2

p2 = 120 / 300 = 0.4 ; (1 - p2) = 0.6

(p1 - p2) ± Zcritical * sqrt[(p1(1 - p1) /n1) + (p2(1 - p2) / n2)]

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2 years ago
Li-Ming owns can ice cream shop. On Saturday, 80 people entered her shop. On Tuesday, 16 people entered her shop. What was the p
hjlf

Answer:

  80% decrease

Step-by-step explanation:

A percentage change can be calculated using ...

  percent change = ((new value)/(old value) -1) × 100%

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  = -0.80 × 100% = -80%

The minus sign indicates the change was a decrease.

From Saturday to Tuesday, customers decreased 80%.

6 0
3 years ago
Jane was asked to find the factors of 8. Here is her work:
alexdok [17]
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3 0
3 years ago
Find the other endpoint given the following <br><br> Endpoint: (5,-3) Midpoint: (7,-6)
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Let's start by calling the known endpoint L and the unknown K. We'll call the midpoint M. In order to find this, we must first note that to find a midpoint we need to take the average of the endpoints. To do this we add them together and then divide by 2. So, using that, we can write a formula and solve for each part of the k coordinates. We'll start with just x values.

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And now we do the same thing for y values

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5 0
3 years ago
I need help with this question
raketka [301]
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3 years ago
Read 2 more answers
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