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nasty-shy [4]
3 years ago
12

A​ car-rental company is interested in the amount of time its vehicles are out of operation for repair work. State all assumptio

ns and find a 90​% confidence interval for the mean number of days in a year that all vehicles in the​ company's fleet are out of operation if a random sample of 10 cars showed the following number of days that each had been inoperative. 10 13 20 15 17 22 8 14 19 7 State all assumptions. Select all the assumptions below. A. The sample comes from a normal population B. The sample size is at least 30 C. It is a random sample D. The variance is less than the mean Find a 90​% confidence interval for the population mean. The 90​% confidence interval is from a lower limit of nothing to an upper limit of nothing. ​(Round to two decimal places as​ needed.)

Mathematics
1 answer:
AlladinOne [14]3 years ago
6 0

Answer:

13.57 < µ < 15.43

Step-by-step explanation:

Assume:  We have to assume the sample comes from a normally distributed population because we do not know the population standard deviation.  

We assume that it was a random sample.

Do not assume:  The sample size is at least 30 because we are that it's 10.  Don't assume the variance is less than the mean because we can calculate it and will know for sure.

To find a 90% confidence interval we need to find the sample mean and sample standard deviation.  See attached photo 1 for the calculations

See attached photo 2 for the construction of the confidence interval

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I need help with this question
kirill115 [55]

Answer:

PART A:

PETER

PART B:

GIWA

PART C:

WEEK 10

Step-by-step explanation:

PART A:

Peter saves $10 every week why GIWA saves $10 every two weeks making it $5 every week.

PART B:

GIWA started with more money. He started with $ 70 why Peter started with $20

PART C:

They both had $120 in the tenth week

5 0
3 years ago
today only, a sofa is being sold at a 36% discount. The sale price is $560. what was the price yesterday?
pashok25 [27]

Answer:

Step-by-step explanation:

Let yesterday's price  be x

Discount percentage = 36%

Sale price = $ 560

(100-36)% of x = 560

64 % *x = 560

\frac{64}{100}*x=560\\\\x=560*\frac{100}{64}\\\\x=875

Yesterday's price = $ 875

8 0
3 years ago
Directions: Follow the instructions for the following inequalities. 1. 4&lt;7 Multiply both sides by 7 , then by 6, then by 3, t
worty [1.4K]

In the given question, we have to perform this experiment and test if the inequality is true or not.

Adding the same value to both sides of the inequality will not change the inequality sign

<h3>Inequality</h3>

data;

  • 4 < 7
  • 11 > - 2
  • -4 < - 2
  • -8 < 8

In the first case, we would do follow the process

6 * 7 * 4 < 7 * 7 * 6\\168 < 294

In the second case;

11 > - 2\\\\5 + 11 > -2 + 5\\3 + 16 > 3 + 3\\4+ 19 > 6 + 4\\23 > 10

In all the scenarios, the operations did not affect the inequality sign because we are doing it equally to all side and at the end of the day nullifies each other.

Learn more on inequality here;

brainly.com/question/24372553

#SPJ1

4 0
2 years ago
How many cubic centimeters is 5 cubic meters.
tresset_1 [31]
The key to solving this question is first knowing how many cubic cm are in one cubic m:

The ratio is always 1000000 cubic cm in 1 cubic meter.

Knowing this, we calculate how many cubic cm are in 5 cubic meters!

<u>1000000 cubic cm </u>= <u>1 </u><span><u>cubic m</u>
      x </span>cubic cm           5 cubic m

x = 1000000 cubic cm x 5 cubic m ÷ 1 cubic m
x = 5<span>000000 cubic cm

Hope this helps!
Feel free to message me if you have any questions :)</span>
4 0
3 years ago
Read 2 more answers
What is the value of x in the equation 2 (x 3) = 4 (x minus 1)? 1 2 3 5.
nordsb [41]

Answer:

-2

Step-by-step explanation:

8 0
2 years ago
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