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3 years ago

What is 4.5(-20)+18=

Mathematics

2 answers:

uranmaximum [27]3 years ago

6 0

Answer:

4.5 (-20) + 18 = -72

Step-by-step explanation:

Hope this helps! O///O

Vikki [24]3 years ago

3 0

Answer:

-72

Step-by-step explanation:

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What is the value of b?<br> please help

Feliz [49]

Answer: ok

Step-by-step explanation:

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3 years ago

A professor thinks that the students in her statistics class this term are less creative than most students at this university.

choli [55]

Answer:

It is not enough evidence to reject null hypothesis. It is not enough evidence to say that mean score is not equal to 35.

Step-by-step explanation:

$\mu=35\\n=23\\\=x=33\\s=5\\\alpha=0.1$

1. Null and alternative hypothesis

$H_{0}:\mu=35\\H_{1}:\mu$

2. Significance level

$\alpha=0.1\\1-\alpha=0.99$

Freedom degrees is given by:

$v=n-1\\v=23-1=22$

For a sgnificance level of 0,01 and 22 freedom degrees, t-student distribution value is:

$t_{0.01;23}=-2. 5083$

3. Test statistic

$t=\frac{\=x-\mu}{\frac{s}{\sqrt{n} } }$

$t=\frac{33-35}{\frac{5}{\sqrt{23} } }$

$t=-1,918$

In this case, we have an one left tailed analysis, it means that null hypothesis is rejected if $t$

$-1.918>-2.5083$

Conclusion:

It is not enough evidence to reject null hypothesis. It is not enough evidence to say that mean score is not equal to 35.

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3 years ago

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Step-by-step explanation:

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∵tanx = sinx×cosx

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