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Eva8 [605]
3 years ago
14

Students in a statistics class conduct a survey to estimate the mean number of units students at their college are enrolled in.

The students took a random sample of 50 students from their college. The students calculated a 90% confidence interval to estimate the mean number of units students at their college are enrolled in. The confidence interval was too wide to provide a precise estimate. The students are strategizing about how to produce a narrower confidence interval. True or false? The students could produce a narrower confidence interval by increasing the sample size to 100.
Mathematics
2 answers:
SVETLANKA909090 [29]3 years ago
6 0

Answer: Students in a statistics class conduct a survey to estimate the mean number of units students at their college are enrolled in. The students took a random sample of 50 students from their college. The students calculated a 90% confidence interval to estimate the mean number of units students at their college are enrolled in. The confidence interval was too wide to provide a precise estimate. The students are strategizing about how to produce a narrower confidence interval. True or false? The students could produce a narrower confidence interval by increasing the sample size to 100.

Step-by-step explanation:

WINSTONCH [101]3 years ago
3 0

Answer:

True

Step-by-step explanation:

The margin of error of a confidence interval is given by:

M = z*\frac{\sigma}{\sqrt{n}}

In which z is the critical value related to the confidence level, \sigma is the standard deviation of the population and n is the size of the sample.

So as n increases, the margin of error decreases, that is, the interval gets narrower.

The students could produce a narrower confidence interval by increasing the sample size to 100.

From the explanation above, the answer is true.

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Delisile spends 30% of her income on rent and 50%of the remaining on food and travelling. she pays R2200,00 per month for educat
DIA [1.3K]

The total monthly income of Delisile including her spendings is R 1,520,000

<h3>How to find Delisile monthly income</h3>

Given:

  • x = Total monthly income

  • Amount spent on rent = 39% of x

= 0.30x

Amount remaining = x - 0.30x

= 0.70x

Amount spent on food and traveling = 50% of 0.70x

= 0.50 × 0.70x

= 0.35x

  • Amount spent on education = R 220,000

  • Amount left = R 312,000

Total = rent + food + education + amount left

x = 0.30x + 0.35x + 220,000 + 312,000

x = 0.65x + 532,000

x - 0.65x = 532,000

0.35x = 532,000

x = R 1,520,000

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If I go to sleep at 10:30, how many hours of sleep will I get if I wake up at 5:00 in the morning?
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Answer:

To test whether or not the population regression function is linear rather than a polynomial of order r​, use the test of ​(minus​1) restrictions using the F Minus Statistic.

Therefore, option D is the correct answer choice.

Step-by-step explanation:

The test of (r-1) restrictions using the F statistic is the most effective way to test whether or not the population regression function is linear rather than a polynomial of order r​.

Therefore, 'use the test of ​(minus​1) restrictions using the F Minus Statistic',  option D is the correct answer choice.

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