Guys help me! 1. What is the domain and range? Help plsss!
1 answer:
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Answer:
Step-by-step explanation:
<u>Given</u>
<u>Simplify</u>
Compare left and right sides and
<u>Find b:</u>
- <u />
b = 15 ⇒ b = 15*3/5 = 9
<u>Find c:</u>
- 1 + c = 7 ⇒ c = 7 - 1 = 6
<u>Find a:</u>
- a + 2 = 10 ⇒ a = 10 - 2 = 8
<u>Find d:</u>
- d = 0
<u>Solution is:</u>
Answer:
A. 12.68 - 14.72 hours
B. Normal distribution.
Step-by-step explanation:
Part A
This question is using quantitative data. A 99% confidence interval means that you want to know the range where 99% of the population will be. To find this you have to convert the 99% CI into the z-score which is -2.58SD to + 2.58SD.
Note that the standard deviation(SD) is from the sample, not the population. We still need to find the standard deviation of the population. The formula is:
population SD =
Where the o= sample SD = 7.4
n= number of sample = 463
The calculation will be:
population SD =
population SD = = 0.3951
The bottom limit will be:
Mean - SD * z-score= 13.7 - 0.3951*2.58 = 12.68 hours
The upper limit will be:
Mean + SD * z-score= 13.7 + 0.3951*2.58 =14.72 hours
The 99% CI range will be 12.68 - 14.72 hours
Part B
The table used to convert confidence interval into z-score depends on the distribution type of the data. Most data is classified as normal distributed, a data type that will concentrated at mean and spread equally from the mean. Normal distribution data will look like a bell which make it also called bell curve.
The question tells you that the data is normal distribution, but that doesn't mean every data is normally distributed. There are a lot of other data distribution type so we have to do some tests to know the normality of the data in real-life data.