1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Mazyrski [523]
3 years ago
11

A certain company produces fidget spinners with ball bearings made of either plastic or metal. Under standard testing conditions

, fidget spinners from this company with plastic bearings spin for an average of 2.7 minutes, while those from this company with metal bearings spin for an average of 4.2 minutes. A random sample of three fidget spinners with plastic bearings is selected from company stock, and each is spun one time under the same standard conditions; let x¯1 represent the average spinning time for these three spinners. A random sample of seven fidget spinners with metal bearings is selected from company stock, and each is likewise spun one time under standard conditions; let x¯2 represent the average spinning time for these seven spinners. What is the mean μ(x¯1−x¯2) of the sampling distribution of the difference in sample means
Mathematics
1 answer:
azamat3 years ago
6 0

Complete Question:

A certain company produces fidget spinners with ball bearings made of either plastic or metal. Under standard testing conditions, fidget spinners from this company with plastic bearings spin for an average of 2.7 minutes, while those from this company with metal bearings spin for an average of 4.2 minutes. A random sample of three fidget spinners with plastic bearings is selected from company stock, and each is spun one time under the same standard conditions; let x¯1 represent the average spinning time for these three spinners. A random sample of seven fidget spinners with metal bearings is selected from company stock, and each is likewise spun one time under standard conditions; let x¯2 represent the average spinning time for these seven spinners. What is the mean μ(x¯1−x¯2) of the sampling distribution of the difference in sample means x¯1−x¯2 ?

A . 3(2.7)−7(4.2)=−21.3

B . 3−7=−4

C . 2.7−4.2=−1.5

D . 2.73−4.27=0.3

E. 4.2−2.7=1.5

Answer:

option C

Step-by-step explanation:

The mean of the sampling distribution of the difference of the sample means will be equal to the difference in population. Here, our answer is: 2.7 - 4.2 = -1.5.

You might be interested in
Please Help!!! I really Need it! Please let me know if I am right for part A... I need help for part B too!
vlabodo [156]

You are correct for part A, good job! :D

As for part B, I <em>believe</em> the answers are function, nonlinear, and discrete.

Please let me know if I was wrong at any time. I hope this helps!!

4 0
2 years ago
Solve the following exponential equations.<br> 2(4^x )+ 4^(x+1 )= 342
Cloud [144]

Answer:

  x ≈ 2.91644500708

Step-by-step explanation:

The equation can be simplified to ...

  2(4^x) +4(4^x) = 342

  6(4^x) = 342

  4^x = 57

Taking logarithms, we get ...

  x = log₄(57) = log(57)/log(4)

  x ≈ 2.91644500708

5 0
2 years ago
HELP PLS
Nataly_w [17]

Answer:

I believe it's d

Step-by-step explanation:

I've took the test before

3 0
2 years ago
8. Use the information below about an example company to calculate the financial ratios below.
11Alexandr11 [23.1K]
<span>Given:
Net profit before tax = $208,000
Total equity = $500,000
Total assets = $330,000
Total liabilities = $150,000
Current assets = $64,000
Current liabilities= $45,000

Return on Equity = Net Income / Shareholder's equity = 208,000 / 500,000 = 0.416 or 41.6%.

Return on Assets = Net Income / Total Assets = 208,000 / 330,000 = 0.63 or 63%

Debt ratio = Total Liabilities / Total Assets = 150,000 / 330,000 = 0.4545 or 45.45%

Debt to equity ratio = Total liabilities / Total Equity = 150,000 / 500,000 = 0.30 or 30%

Current ratio = Current Assets / Current Liabilities = 64,000 / 45,000 = 1.42</span>
8 0
2 years ago
A total of 243 adults and children are at a movie theater. There are 109 more adults than children in the theater. If eh represe
Marina86 [1]
The system should look like this:

eh + b = 243
eh - b = 109
6 0
3 years ago
Other questions:
  • Circle 1 is centered at (5, 8) and has a radius of 8 centimeters. Circle 2 is centered at (1, −2) and has a radius of 4 centimet
    15·1 answer
  • A standard pair of six-sided dice is rolled. what is the probability of rolling a sum greater than 66? express your answer as a
    7·1 answer
  • The graph of a logarithmic has a vertical asymptote at x=4 , contains the point (e+4, 1) , and has an x-intercept of 5. Which fu
    8·1 answer
  • Multiply (−7)(2)(−2).
    15·2 answers
  • Select the best answer for the question 7/8=?/48
    14·2 answers
  • What must be true to define the measure of a distance of an arc between the points A and B on a circle?
    12·1 answer
  • Find the slope of a line that passes through the points
    6·1 answer
  • The length of a rectangle is 3 1/6 cm longer than the width. The perimeter of the rectangle is 15 1/3 cm. What are the width and
    8·1 answer
  • A jar is filled with 70 cubes. There are 15 red cubes, 9 green cubes, 21 yellow cubes, 20 purple cubes, and 5 orange cubes. Writ
    8·1 answer
  • Please help!!!!!!!!!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!