Answer:
1. A matched-pairs t-test is valid, despite the sample being a small representation of the population, because the sample is a simple random sample and has a distribution with a single peak.
Step-by-step explanation:
The matched-pairs test is valid, for the reasons given in choice 1. Here's why:
- We do have matched pairs, not a 2-sample t-test, because each two are paired by the house they live in. Husband and wife live together: it's safe to pair them. (This rules out option 5.)
- Check conditions: The sample is large enough (fulfilling the <u>sample size condition)</u>. The sample data is fairly normal, although we don't know the population data, and the sample size is over 40, so we consider it a fairly large sample (fulfilling the <u>nearly normal condition)</u>. We don't know about outliers, but we'll have to assume Ted doesn't have any, because they aren't mentioned.
Answer:
2(10+15)= (2x10)+(2x15) 20+30=50
Step-by-step explanation:
Length (L): 2w + 5
width (w): w
Perimeter (P) = 2L + 2w
136 = 2(2w + 5) + 2(w)
136 = 4w + 10 + 2w
136 = 6w + 10
126 = 6w
21 = w
Length (L): 2w + 5 = 2(21) + 5 = 42 + 5 = 47
Answer: width = 21 meters, length = 47 meters
The answer should be negative 12. Take the 2 and square it then multiply by -3.