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sattari [20]
3 years ago
13

A manager of the credit department for an oil company would like to determine whether the mean monthly balance of credit card ho

lders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the mean owed is $83.40 with a sample standard deviation of $23.65. If you were to conduct a test to determine whether the auditor should conclude that there is evidence that the mean balance is different from $75, which test would you use? a) Z-test of a population mean b) Z-test of a population proportion c) t-test of population mean d) t-test of a population proportion
Mathematics
1 answer:
valkas [14]3 years ago
6 0

Answer:

c) t-test of population mean

Explanation:

The t-test statistic is used in hypothesis testing. Here we would use a one sample t test to test our hypothesis. The one sample t test measures the statistical difference between the hypothesized mean and the sample mean. In a one sample t test or single sample t test, a test variable is measured against a test value.

Example we compare our test variable to the hypothesized mean value $75 above.

The t test is used instead of z score when standard deviation is unknown.

Using the t test, we either accept or reject the null hypothesis given alternative hypothesis.

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Please write a equation for this table
Hitman42 [59]

Answer:

  y = 5x +2

Step-by-step explanation:

The point (0, 2) tells us the y-intercept is 2.

If we translate the table down 2 units by subtracting 2 from every y-value, it becomes ...

  6, 30

  -2, -10

  0, 0

  10, 50

We notice these values are all related by a factor of 5 (they are proportional). That means the equation will be a straight line with slope 5 and y-intercept 2.

  y = 5x +2

6 0
2 years ago
F(t)=2t-3<br><br><br> f(7)=<br><br> Pleasssssssse helllllpppp<br> I only have 2 minutes 15 points
yaroslaw [1]
F(7)= 11 if this is right mark 5 star

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3 years ago
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PLEASE PLEASE HELP ME WITH THIS PLEASE!!! ITS IXL
yarga [219]

Answer:

below

Step-by-step explanation:

The point N is at (-7, -8)

The point N’ is at (4, -4)

On the x-axis, -7 to 4 is a shift of 11 units to the right.

On the y-axis, -8 to -4 is a shift of 4 units upward.

To find the scale factor, we need to find the change in radius size.

As previously identified, the center of Circle N is (-7, -8). If we draw a vertical line from the center to the edge of the circle, the line will be 2 units long.

As previously identified, the center of Circle N’ is (-4, -4). If we draw a vertical line from the center to the edge of the circle, the line will be 6 units long.

6 is 3 times the amount of 2, meaning the scale factor is 3.

Hope this helps!

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3 years ago
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Which of the following are properties of right triangles?
sineoko [7]
The properties that apply true are:

1–as it implies the Pythagorean theorem; a^2+b^2=c^2

3–as it implies the basic rules of visualized geometry.

4–as the greater side(hypotenuse) is opposite the right angle.

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3 years ago
The ___ is the average of the sum of the squared differences of the mean from each element in a set of numerical data.
Bess [88]

Answer:

Variance.

Step-by-step explanation:

that is the variance of the data.

The square root of the variance is the Standard Deviation.

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2 years ago
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