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stiks02 [169]
3 years ago
9

What is 3 to the sixth power times 3 there is a picture please help worth 12 pts.!!!!!

Mathematics
1 answer:
Diano4ka-milaya [45]3 years ago
6 0

Answer:

2187 ( 3 to the 7th)

Step-by-step explanation:

3 to the 6th= 729

729 x 3 = 2187

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Write an algebraic equation for a sweater that was originally x dollars and is on sale for $187.50. *
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3 years ago
A research engineer for a tire manufacturer is investigating tire life for a new rubber compound. She has built 10 tires and tes
n200080 [17]

Answer:

The standard deviation of tire life does exceed 3000 km

Step-by-step explanation:

This is a Chi-Square Hypothesis Test for the Standard Deviation, here we have

\bf H_0: \sigma = 3000

\bf H_a: \sigma > 3000

so, this is an upper one-tailed test.

The <em>test statistic</em> is

\bf T=\frac{(n-1)s^2}{\sigma^2}

where

<em>n = 10 is the sample size</em>

<em>s = sample standard deviation</em>

\bf \sigma = population standard deviation

we would reject the null hypothesis if

\bf T>\chi^2_{(\alpha,n-1)}

where

\bf \chi^2_{(\alpha,n-1)}

is the critical value corresponding to the level of significance \bf \alpha with n-1 degrees of freedom.

we can use either a table or a spreadsheet to compute this value.

In Excel use

CHISQ.INV(0.05,9)

In OpenOffice Calc use

CHISQINV(0.05;9)

and we get this value equals 3.3251

Working out our T statistic

\bf T=\frac{(n-1)s^2}{\sigma^2}=\frac{9*(2990)^2}{(3000)^2}=8.9401

Since T > 3.3251 we reject the null and conclude that the standard deviation of tire life exceeds 3000 km.

7 0
3 years ago
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