Question

from a normally distributed population, a simple random sample of size 30 is taken. The mean of the sample is 144 and the standard deviation of the sample is 12. Which interval is the 90% confidence interval for the population mean? @directrix

Answer 1

Did you get this? I'm testing an online calculator.

Results

Confidence Interval:

±3.6

Range for the true population mean:

140.4 to 147.6

Answer 2

where did you find that calculator! that is amazing

Answer 3

https://www.mccallum-layton.co.uk/tools/statistic-calculators/confidence-interval-for-mean-calculator/

Answer 4

The thing about any of these online calculators is whether they give correct results.

Answer 5

So, are you and the Stats calculator in agreement?

Answer 6

yes it seems correct to me thank you veryy much :)

Answer 7

It was a serendipitous find. The calc may be helpful.

Answer 8

yes it is very much :) and I have one last question just give me a second to type it down :)

Answer 9

I thought you had four questions.

Answer 10

yes but thanks to the calculator I only have one more :)

Answer 11

Suppose a research team takes a simple random sample of 100 Parma
wallabies. In this sample, the tails of the wallabies have a mean length
of 46 centimeters and a standard deviation of 2.6 centimeters.

Answer 12

What percent of the time would you expect a
simple random sample of 100 Parma wallabies
to have a sample mean that is not in the 95%
confi dence interval?

Answer 13

@Directrix

Answer 14

would it be any number outside of the range of -0.51 and +0.51

Answer 15

I>>What percent of the time

Is the answer supposed to be a percentage?

Answer 16

yes

Answer 17

I have 10%
2.5%
5%
0%

Answer 18

>>t is not in the 95% confi dence interval?

100% = 95% = 5% of the time is what I think. -->

Outside means below or above the confidence interval.

2.5% of the time the mean will be above the confidence interval.

Answer 19

Did you go with 5% ?

Answer 20

I actually thought it was 10%

Answer 21

2.5% on either side so 2*2.5% = 5% is how I am thinking. Go with your thinking.

Answer 22

idk is confusing to me do you have someone to ask for a second opinion?

Answer 23

5%

Answer 24

There will be others who know on later tonight. I'll ask then.

Answer 25

nah dont worry but then 5% or 2.5%

Answer 26

??

Answer 27

@Nnesha your opinion pls

Answer 28

I am sticking with this: 5%