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Soloha48 [4]
2 years ago
5

Use the derivative function, f ' ( x ) , to determine where the function f ( x ) = − 2 x 2 + 13 x − 8 is increasing.

Mathematics
1 answer:
prisoha [69]2 years ago
4 0

Answer:

f is increasing on interval (-infty, 13/4)

Inequality notation: x<13/4

In words: f is increasing on the interval of x that is less than 13/4.

Step-by-step explanation:

f is increasing on interval of x if f' of such interval is positive.

f=-2x^2+13x-8

Differentiate both sides

(f)'=(-2x^2+13x-8)'

Sum and difference rule:

f'=(-2x^2)'+(13x)'-(8)'

Constant multiple rule:

f'=-2(x^2)'+13(x)'-(8)'

Power rule (recall x=x^1):

f'=-2(2x^1)+13(1x^0)-(8)'

Constant rule:

f'=-2(2x^1)+13(1x^0)-(0)

Recall again x^1=x:

f'=-2(2x)+13(1x^0)-(0)

Recall x^0=1:

f'=-2(2x)+13(1×1)-(0)

Associative property of multiplication:

f'=-(2×2)x+13(1×1)-(0)

Performed grouped multiplication:

f'=-(4)x+13(1)-(0)

f'=-4x+13-(0)

Additive identity:

f'=-4x+13

f' is positive when -4x+13>0.

Subtract 13 on both sides:

-4x>-13

Divide both sides by -4:

x<-13/-4

x<13/4

f is increasing on interval (-infty, 13/4)

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(a) Null Hypothesis, H_0 : \mu = 22 ounces  

    Alternate Hypothesis, H_A : \mu\neq 22 ounces

(b) The value of the test statistic is -2.687.

(c) The critical values are -1.96 and 1.96.

(d) We conclude that Reject H_0 since the value of the test statistic is less than the negative critical value.

Step-by-step explanation:

We are given that a local bottler in Hawaii wishes to ensure that an average of 22 ounces of passion fruit juice is used to fill each bottle.

He takes a random sample of 65 bottles. The mean weight of the passion fruit juice in the sample is 21.54 ounces. Assume that the population standard deviation is 1.38 ounce.

<em>Let </em>\mu<em> = average ounces of passion fruit juice used to fill each bottle.</em>

(a) So, Null Hypothesis, H_0 : \mu = 22 ounces     {means that the average of 22 ounces of passion fruit juice is used to fill each bottle}

Alternate Hypothesis, H_A : \mu\neq 22 ounces     {means that the average different from 22 ounces of passion fruit juice is used to fill each bottle}

The test statistics that would be used here <u>One-sample z test statistics</u> as we know about the population standard deviation;

                        T.S. =  \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }  ~ N(0,1)

where, \bar X = sample mean weight of the passion fruit juice = 21.54 ounces

            \sigma = population standard deviation = 1.38 ounce

            n = sample of bottles = 65

So, <u><em>test statistics</em></u>  =  \frac{21.54-22}{\frac{1.38}{\sqrt{65} } }  

                               =  -2.687

(b) The value of z test statistics is -2.687.

(c) Since, in the question we are not given with the level of significance so we assume it to be 5%. Now, at 5% significance level the z table gives critical values of -1.96 and 1.96 for two-tailed test.

<em>Since our test statistics does not lie within the range of critical values of z, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which </em><u><em>we reject our null hypothesis</em></u><em>.</em>

Therefore, we conclude that Reject H_0 since the value of the test statistic is less than the negative critical value which means that the average different from 22 ounces of passion fruit juice is used to fill each bottle.

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