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Question number: 213

Question

Suppose we wish to estimate the average height of the tigers in India. We take a sample of 130 tigers and measure their heights. The mean height is 98.249 cms. The calculated standard deviation is cms, then the confidence interval for the population mean at 95 % confidence limit is

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Choice (4)

Response

a.

b.

c.

d.

Question number: 214

Question

Suppose we want to estimate the average weight of cow in India. We draw a random sample of 1,000 cows and weigh them. The mean was 180 pounds with a standard deviation of 30 pounds. What is the 95 % confidence interval?

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Question number: 216

Question

According to a water supply company, the mean water bill per year in 2010 is 1500 Rs. And he wants to estimate the amount of water bill per year in 2016. He takes a random sample of 18 households and obtains the following amounts, (in Rs) for the year 2016 of water bill. It is given that

Samples from water company

What are the readings of the family?

1608

1875

1264

1794

1478

1999

1828

2206

1798

1794

1738

1740

1598

1486

1830

1568

1941

1516

how can you interpret the answer if you compute 95 % confidence interval of the mean water bill?

Choices

Choice (4)

Response

a.

It appears that the mean annual water bill has increased from 2010 to 2016

b.

It appears that there is no change in the mean annual water bill from 2010 to 2016

c.

It appears that the mean annual water bill has decreased from 2010 to 2016