Answer:
The correct option is (c).
Step-by-step explanation:
The assumptions of a two-sample <em>t</em>-test are:
- Independent samples
- Normality
- Equal variances
It is provided that the sample of selected for American adults under the age of 40 is of size, <em>n</em>₁ = 488 and the sample of selected for American adults aged 40 or over is of size, <em>n</em>₂ = 421.
As the sample size is quite large the according to the Central limit theorem the sampling distribution of the sample mean would follow a Normal distribution.
And even if the sample was selected by dialing of various telephone numbers, the sample is not biased since the size of the sample is too large.
So, the sample can be considered as a simple random sample.
Thus, the conditions for two-sample t inference are satisfied.
The correct option is (c).
Answer:
Divide 5 by 16 and that’s 0.3125 round to 0.31
Answer:
Given: R is the midpoint of QS.
QS=40
Now,
QR=40/2(R IS THE MIDPOINT)
=20
Answer:
Uh oh! It looks like your question is missing some crucial information. Please repost it with any helpful information such as diagrams, excerpts, or answer choices needed to solve it.
Step-by-step explanation:
3x + 2 is one possible choice
Assuming you mean flutes 5: clarinets 4: trumpets 3...
Question 1 Answer: There are <u>36 trumpets</u>
Question 1 Explanation: 60/5=12 (the amount it went up in ratio), then multiply 12 by each of the other ratios. If there are 60 flutes then there are 48 clarinets (4*12) and 36 trumpets (3*12). If you want to check work, you can then divide answer back by 12 and get the ratio again.
Assuming there are no other type of band instruments in Carver's band then...
Question 2 Answer:There are 50 flutes, <u>40 </u>clarinets, and 30 trumpets.
Question 2 Explanation: add the ratio then divide it by the number of band people (5+4+3=12: 120/12=10) this answer is then what you multiply for each ratio. So, flutes 5*10=50, clarinets 4*10=40, trumpets 3*10=30. 50+40+30=120. Therefore, if there are no other type of band instruments in Carver's band there are 40 people who play the clarinet (unless of course some are played by computers/robots or an amazing person can play multiple at a time.
