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Andreyy89
3 years ago
10

A cross country coach just announced that, by the end of the quarter, all students should run the 10 miles in less than 70 minut

es. there are 15 students in the group.
Mathematics
1 answer:
lapo4ka [179]3 years ago
4 0
10x70= 700
700 x 15= 10,500

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Suppose that at a state college, a random sample of 41 students is drawn, and each of the 41 students in the sample is asked to
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Answer:

The  confidence interval for 90% confidence would be narrower than the 95% confidence

Step-by-step explanation:

From the question we are told that

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For a 95% confidence the level of significance is  \alpha  = [100 - 95]\% =  0.05 and

the critical value  of  \frac{\alpha }{2}  is   Z_{\frac{\alpha }{2} } =Z_{\frac{0.05 }{2} }=  1.96

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the critical value  of  \frac{\alpha }{2}  is   Z_{\frac{\alpha }{2} } =Z_{\frac{0.10 }{2} }=  1.645

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Now the margin of error is mathematically represented as

         E =  Z_{\frac{\alpha }{2} } *  \frac{s}{\sqrt{n} }

given that other values are constant and only Z_{\frac{\alpha }{2} } is varying we have that

         E\ \  \alpha \ \   Z_{\frac{\alpha }{2} }

Hence for  reducing confidence level the margin of error will be reducing

  The  confidence interval is mathematically represented as

        \= x  - E  <  \mu <  \= x  + E

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3 0
3 years ago
Admission to the fair costs $8.75. Each ride costs $0.50 to ride. You can spend at most $16. Write and solve an inequality to re
sergij07 [2.7K]
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5 0
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Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a randomly s
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Answer:

The bill size can be considered usual.

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