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sp2606 [1]
3 years ago
15

If it is assumed that the heights of men are normally distributed with a standard deviation of 2.5 inches, how large a sample sh

ould be taken to be fairly sure (probability 0.95) that the sample mean does not differ from the true mean (population mean) by more than 0.90 in absolute value? (Round your answer up to the nearest whole number.)
Mathematics
1 answer:
Volgvan3 years ago
7 0

Answer:

30 men

Step-by-step explanation:

In order to be sure that the sample mean does differ from the population mean by more than 0.90, the sample size (n) that should be used is given by:

0.90 < Z\frac{s}{\sqrt{n}}

Where 'Z' , for a 95% probability is 1.960, 's' is the standard deviation of 2.5 inches:

0.90 > 1.960\frac{2.5}{\sqrt{n}}\\n >(\frac{1.960*2.5}{0.9})^2\\n>29.64

Rounding up to the nearest whole number, the sample size should be at least 30 men.

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What is the alternating sum of digits
Morgarella [4.7K]

Answer:Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number. So, for instance, 2728 has alternating sum of digits 2 – 7 + 2 – 8 = -11. Since -11 is divisible by 11, so is 2728.

Hope this helped

6 0
3 years ago
Researchers found a linear relationship between tail-feather length (in mm) and weight (in g) in a random sample of 20 male long
Dafna11 [192]

Answer:

   

Step-by-step explanation:

As far as I know, this question is not correct. I have the searched the internet and found a similar question which makes sense. In the correct question, 95% Confidence Interval is already given calculated from the software and

<em>95% prediction interval is asked (PI) for the weight of one male long tailed finch weighing 20 g.</em>

We have this data given in the correct question found on internet. And they have calculated this data using software:

New Obs = 20

Fit = 92.34

SE Fit = 5.26

95% Confidence Interval = (81.29, 103.38)

95% Prediction Interval = (67.61, 117.06)

Now, Just look at the prediction interval:

Now the formula for Prediction Interval = Point Estimate ± Margin of Error

Upper limit for prediction interval = 117.06

lower limit = 67.61

Formula for point estimate = (Upper + Lower)/2

Point Estimate = (117.06 + 67.61)/2

Point Estimate = 92.34

Formula for margin of error = (Upper - Lower)/2

Margin of Error = (117.06 - 67.61)/2

Margin of Error = 24.72

Formula for Prediction Interval = Point Estimate ± Margin of Error

PI = 92.34 ± 24.72

4 0
3 years ago
Please answer ASAP!!!
Gwar [14]

Answer:

Wheres the question

Step-by-step explanation:

4 0
3 years ago
Combine like terms,<br><br> 1)c+19-4<br><br> 2)m+12-10
rewona [7]
1) Would be c+15 because you can combine 19-4

2) Would be m+2 because you can combine 12-10
8 0
3 years ago
Read 2 more answers
The regular hexagon below is centered at the origin. It is rotated clockwise around the origin through an angle of k° For which
tatiyna
Option D is correct hope i helped at all
4 0
3 years ago
Read 2 more answers
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