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vova2212 [387]
4 years ago
6

Please answer correctly !!!! Will mark brainliest !!!!!!!!!

Mathematics
1 answer:
Korvikt [17]4 years ago
5 0

Answer:

b= \frac{-4}{7} a - \frac{52}{7}

Step-by-step explanation:

1st, isolate b.

7b=-4a-52

Next, divide both sides by 7.

b=(-4a/7)-(52/7)

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g Georgianna claims that in a small city renowned for its music school, the average child takes at least 5 years of piano lesson
sergij07 [2.7K]

Answer:

[3.75 years, 5.45 years]

Step-by-step explanation:

The 90% confidence interval is given by the interval

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<em>\large \bar x is the sample mean  </em>

<em>s is the sample standard deviation  </em>

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\large t^* is the 0.05 (5%) both-sided (**) critical value for <em>the Student's t-distribution with 19 degrees of freedom (sample size -1), which is an approximation to the Normal distribution for small samples (n≤ 30). </em>

Either by using a table or the computer, we find  

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\large [4.6-1.729*\frac{2.2}{\sqrt{20}}, 4.6+1.729*\frac{2.2}{\sqrt{20}}]=\boxed{[3.75,5.45]}

(**) 5% of the area to the left of \large  -t^* and 5% to right of \large t^* for a total of 90% inside the interval \large [-t^*,+t^*]

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3 years ago
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