What is 2* 5 equal to?

Is this table a function? explain how you know

KengaRu [80]

No, because the x values repeat.

6 0

3 years ago

Independent random samples taken on two university campuses revealed the following information concerning the average amount of

love history [14]

Answer:

$p_v =P(t_{88}>6.960) =2.91x10^{-10}$

So with the p value obtained and using the significance level given $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the mean of the group A is significantly lower than the mean for the group B.

Step-by-step explanation:

The statistic to test the hypothesis is given by this formula:

$t=\frac{(\bar X_A-\bar X_B)-(\mu_{A}-\mu_B)}{\sqrt{\frac{s_A^2}{n_A}}+\frac{s_B^2}{n_B}}$

Where t follows a t distribution with $n_1+n_2 -2$ degrees of freedom

The system of hypothesis on this case are:

Null hypothesis: $\mu_A \leq \mu_B$

Alternative hypothesis: $\mu_A >\mu_B$

Or equivalently:

Null hypothesis: $\mu_A - \mu_B \leq 0$

Alternative hypothesis: $\mu_A -\mu_B>0$

Our notation on this case :

$n_A =50$ represent the sample size for group A

$n_B =40$ represent the sample size for group B

$\bar X_A =280$ represent the sample mean for the group A

$\bar X_B =250$ represent the sample mean for the group B

$s_A=20$ represent the sample standard deviation for group A

$s_B=23$ represent the sample standard deviation for group B

And now we can calculate the statistic:

$t=\frac{(280 -250)-(0)}{\sqrt{\frac{20^2}{50}}+\frac{23^2}{40}}=6.511$

Now we can calculate the degrees of freedom given by:

$df=50+40-2=88$

And now we can calculate the p value using the alternative hypothesis:

$p_v =P(t_{88}>6.960) =2.91x10^{-10}$

So with the p value obtained and using the significance level given $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the mean of the group A is significantly lower than the mean for the group B.

8 0

3 years ago

Read 2 more answers

50 envolopes for 2.49 or 90 for 5 .50

Elza [17]

Answer:

The better deal would be to buy the 50 envelopes for a total of $2.49

Step-by-step explanation:

Identify what you know:

1) You can buy a pack of 50 envelopes for $2.49

2) You can buy 90 envelopes for $5.50

Divide the number of enveloped by the prices, to find the price of ONE envelope in the pack. See:

$2.49/50 envelopes = $0.0498

$5.50/90 envelopes = $0.061

Also... where is THIS person buying envelopes... I want that price....

3 0

4 years ago

Raji has 5/7 as many CDs as Megan. If Raji gives 1/10 of her CDs to Megan, what will be the ratio of the number of Raji’s CDs to

Alexeev081 [22]

Answer:

3:5

Step-by-step explanation:

Please see attached picture for full solution. ( Unit method)

6 0

3 years ago

HELP 5 STAR AND THANKS!!!!!!! Which scale factors produce an expansion under a dilation of the original image? Select each corre

puteri [66]

I think the answers are the 1 and the 3

5 0

3 years ago