If x=7 and y=−2, evaluate the following expression:7(2x−3y)

A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics e

professor190 [17]

Answer:

$\chi^2 =\frac{15-1}{25} 16 =8.96$

The degrees of freedom are given by:

$df = n-1 = 15-1=14$

The p value for this case would be given by:

$p_v =P(\chi^2$

Since the p value is higher than the significance level we have enough evidence to FAIL to reject the null hypothesis and we can conclude that the true deviation is not ignificantly lower than 5 minutes

Step-by-step explanation:

Information given

$n=15$ represent the sample size

$\alpha=0.05$ represent the confidence level

$s^2 =16$ represent the sample variance

$\sigma^2_0 =25$ represent the value that we want to verify

System of hypothesis

We want to test if the true deviation for this case is lesss than 5minutes, so the system of hypothesis would be:

Null Hypothesis: $\sigma^2 \geq 25$

Alternative hypothesis: $\sigma^2$

The statistic is given by:

$\chi^2 =\frac{n-1}{\sigma^2_0} s^2$

And replacing we got:

$\chi^2 =\frac{15-1}{25} 16 =8.96$

The degrees of freedom are given by:

$df = n-1 = 15-1=14$

The p value for this case would be given by:

$p_v =P(\chi^2$

Since the p value is higher than the significance level we have enough evidence to FAIL to reject the null hypothesis and we can conclude that the true deviation is not ignificantly lower than 5 minutes

6 0

3 years ago

Please help, I’m struggling

Naddika [18.5K]

Answer:

49.5 mi

Step-by-step explanation:

Area of a triangle is A = (height) X (base) / 2

So if you plug in the numbers you get:

806.9 = (32.6) X (base) / 2

1613.8 = (32.6) X (base)

1613.8 / 32.6 = base

base = 49.5 mi

8 0

3 years ago

El 10 es numero racional?

FrozenT [24]

Answer:

si. yes

Step-by-step explanation:

yes it is 10÷1 = 10

3 0

3 years ago

Un niño de 1,5 de altura divisa una piedra en el suelo con un ángulo de depresión de 37° a qué distancia se encuentra el niño de

Masja [62]

Answer:

english?

Step-by-step explanation:

6 0

3 years ago

Gavin drank 3/4 of a orange juice from a container, which was 3/8 of the orange juice that was originally in the container.how m

NNADVOKAT [17]

So 3/4 is not the same as 3/8 so you have to make it the same multiply both 3 and 4 by 2 which is 6/8+ 3/8 and that is 9/8 then 1 1/8

3 0

3 years ago

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If x=7 and y=−2, evaluate the following expression:7(2x−3y)​

If x=7 and y=−2, evaluate the following expression:7(2x−3y)