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3 years ago

13

Write an equation that could be used to solve the given problem: if twice a number is increased by 15 , the result is the same a

s when 10 is subtracted from the number.

2 answers:

Semmy [17]3 years ago

7 0

Equation 2X+15= X-10

X=-25

My name is Ann [436]3 years ago

5 0

2x+15=x-10 . It helps to read these problems out loud and then try to write out the equation :)

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Researchers report that on average freshman who live on campus gain 15 pounds during their first year in college. You survey 10

neonofarm [45]

Answer: 1.460

Step-by-step explanation:

Given : Researchers report that on average freshman who live on campus gain 15 pounds during their first year in college.

Let $\mu$ represents the population mean .

Then, the set of hypothesis will be:-

$H_0: \mu=15$

$H_a:\mu\neq15$

We assume that this is normal distribution.

Sample size : n = 10, which is a small sample (n<30) ,s o we use t-test.

Sample mean : $\overliene{x}=16.2\ lbs$

Standard deviation : $\sigma=2.6$

The test statistic for population mean for small sample is given by :-

$t=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

$t=\dfrac{16.2-15}{\dfrac{2.6}{\sqrt{10}}}=1.45951276623\approx1.460$

Hence , the value of test statistic = 1.460

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Answer:

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