O a<-21
O a> 21-1/
O a <21/13
Answer:
1/3
Step-by-step explanation:
Answer:
x = -8
Step-by-step explanation:
Step 1: Write equation
1/2x + 13 = 9
Step 2: Solve for x
Step 3: Check
Plug in x to verify it's a solution.
1/2(-8) + 13 = 9
-4 + 13 = 9
9 = 9
Answer:
-8
Step-by-step explanation:
you use inverse operation
meaning opposite signs
subtract -13 from 13 cross it out
subtract 13 from 9
you get 1/2x=-4
divide 1/2 on both sides
-4 divided by 1/2 =-8
8 1
16 2
24 A
B 4
The symbol π represents the long-run proportion of all the couples that lean their heads
leftright
while kissing.
Which of the following best describes the null hypothesis and the alternative hypothesis using π?
null: π ≠ 0.5, alternative: π > 0.5
null: π = 0.5, alternative: π < 0.5
null: π = 0.5, alternative: π > 0.5
null: π ≠ 0.5, alternative: π < 0.5
Of the 124 kissing couples, 80 were observed to lean their heads right. What is the observed proportion of kissing couples who leaned their heads to the right? What symbol should you use to represent this value? (Round answer to 3 decimal places, e.g. 5.275)
p^=
the absolute tolerance is +/-0.001
Determine the standardized statistic from the data. (Hint: You will need to get the standard deviation of the simulated statistics from the null distribution.) (Round answer to 2 decimal places, e.g. 52.75)
z =
the absolute tolerance is +/-0.02
Interpret the meaning of the standardized statistic.
The observed proportion of couples who leaned to the right when kissing is 3.22 standard deviations above the null hypothesized value of 0.50.
The observed proportion of couples who leaned to the right when kissing is 3.22 standard deviations away from the null hypothesized value of 0.50.
The observed proportion of couples who leaned to the right when kissing is 3.22 standard deviations below the null hypothesized value of 0.50.
Select the best conclusion that you would draw about the null and alternate hypotheses.
We have strong evidence that the proportion of couples that lean their heads to the right while kissing is more than 50%.
We have strong evidence that the proportion of couples that lean their heads to the right while kissing is less than 50%.
We have strong evidence that the proportion of couples that lean their heads to the right while kissing is 50%.
We have strong evidence that the proportion of couples that lean their heads to the right while kissing is near to 50%.
Answer:
1) null: π = 0.5, alternative: π > 0.5
2)p^= 80/124 =0.645
std error =(phat(1-phat)/n)1/2 =0.0430
3)z = (phat-p)/std erro =(0.645-0.5)/0.0430 =3.22
4)The observed proportion of couples who leaned to the right when kissing is 3.22 standard deviations above the null hypothesized value of 0.50
5)We have strong evidence that the proportion of couples that lean their heads to the right while kissing is more than 50%