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
forsale [732]
3 years ago
9

A random sample of 160 car crashes are selected and categorized by age. The results are listed below. The age distribution of dr

ivers for the given categories is 18% for the under 26 group, 39% for the 26-45 group, 31% for the 45-65 group, and 12% for the group over 65. Calculate the chi-square test statistic
χ to test the claim that all ages have crash rates proportional to their driving rates.
1. Under 26 = 66 drivers
2. 26-45 = 39 drivers
3. 46-65 = 25 drivers
4. Over 65 = 30 drivers
Mathematics
1 answer:
sasho [114]3 years ago
5 0

Answer:

25.05

Step-by-step explanation:

Given that a random sample of 160 car crashes are selected and categorized by age. The results are listed below. The age distribution of drivers for the given categories is 18% for the under 26 group, 39% for the 26-45 group, 31% for the 45-65 group, and 12% for the group over 65.

     

<26 26-45 46-65` >65  

Observed  O 66 39 25 30 160

Expected  E 40 40 40 40 160

     

Chi square      

(O-E)^2/E 16.9 0.025 5.625 2.5 25.05

Thus we get chi square test statistic = 25.05  

You might be interested in
12. (2v^3 - v + 8) + (-v^3 + v - 3)<br><br> 14. (4h^3 + 3h + 1) - (-5h^3 + 6h - 2)
Lana71 [14]
12. On addition, you can just combine like terms.
2v^3+(-v^3)=v^3
-v+v cancels each other out
8+(-3)=5
So you have v^3+5

14 On subtraction, you have to remember to distribute the negative sign so after you do that you have:
4h^3+3h+1+5h^3-6h+2
Then you can combine like terms
4h^3+5h^3=9h^3
3h-6h=-3h
1+2=3
So you end up with:
9h^3-3h+3

Hope that helps and feel free to ask any questions.
7 0
3 years ago
A study revealed a strong, linear, negative association between a decrease in salary and amount spent on clothes. Another study
kakasveta [241]

Answer:

A. simpson's paradox

Step-by-step explanation:

The Simpson's paradox was named after Edward Simpson, the person who described this paradox for the first time in 1951. In this paradox, you find two contrary patterns. For example, a positive and a negative correlation, depending on how data is analyzed. The differences in the analyses are how data are grouped. This paradox is observed often in social researches. Most of the times, results are affected by the sample on each group or additional information related to the data.

5 0
3 years ago
With direct variation, if you increase the input, the output
sladkih [1.3K]

Increases proportionally. (C)

4 0
3 years ago
What is the answer to 3x +5x
s344n2d4d5 [400]
3x+5x= 8x
I hope this helps !!
6 0
2 years ago
Read 2 more answers
Please Help me I am struggling a lot and I would be very grateful!!!
yKpoI14uk [10]
The answer would be iii: 10-15%
the way to find this is to divide 43 by 381 to get 11.2% which falls in the rage of 10-15%
5 0
3 years ago
Other questions:
  • Use the drawing tool(s) to form the correct answer on the provided grid.
    12·2 answers
  • I'M OFFERING 20 POINTS AND BRAINLIEST ANSWER FOR HELP
    6·1 answer
  • What is the answer to 4 times 4 divided by 2
    15·2 answers
  • Consider the universal relation r = {a, b, c, d, e, f, g, h, i, j} and the set of functional dependencies f = { {a, b } → {c}, {
    15·1 answer
  • Which of the following statements is true about
    13·1 answer
  • 5x – 3y &gt; 6<br> 3x + 2y 2 4
    15·1 answer
  • What’s the mean,median,mode and range
    6·1 answer
  • Round your answer to the nearest hundredth.
    5·1 answer
  • 36 first-graders and 14 other students attended a school assembly. What percentage of the students at the assembly were first-gr
    13·1 answer
  • 9 divided by 3/4 pls help
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!