1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Daniel [21]
3 years ago
14

Which number sentence is in the same family facts.

Mathematics
1 answer:
DanielleElmas [232]3 years ago
7 0
Ok, but i think you explained it bad, tag me again so i can answer
You might be interested in
Please help me solve this problem. ​
schepotkina [342]

Answer:

Step-by-step explanation:

There is no solution

5 0
3 years ago
Read 2 more answers
Jon borrows $6.50 from his friends to pay for snacks , and $11.75 from his sister to go to the movies. How much money does he ne
Naddik [55]

Answer:

$18.25

Step-by-step explanation:

5 0
3 years ago
a math teacher claims that she has developed a review course that increases the score of students on the math portion of a colle
madam [21]

Answer:

A.

H_0: \mu\leq514\\\\H_1: \mu>514

B. Z=2.255. P=0.01207.

C. Although it is not big difference, it is an improvement that has evidence. The scores are expected to be higher in average than without the review course.

D. P(z>0.94)=0.1736

Step-by-step explanation:

<em>A. state the null and alternative hypotheses.</em>

The null hypothesis states that the review course has no effect, so the scores are still the same. The alternative hypothesis states that the review course increase the score.

H_0: \mu\leq514\\\\H_1: \mu>514

B. test the hypothesis at the a=.10 level of confidence. is a mean math score of 520 significantly higher than 514? find the test statistic, find P-value. is the sample statistic significantly higher?

The test statistic Z can be calculated as

Z=\frac{M-\mu}{s/\sqrt{N}} =\frac{520-514}{119/\sqrt{2000}}=\frac{6}{2.661}=2.255

The P-value of z=2.255 is P=0.01207.

The P-value is smaller than the significance level, so the effect is significant. The null hypothesis is rejected.

Then we can conclude that the score of 520 is significantly higher than 514, in this case, specially because the big sample size.

C.​ do you think that a mean math score of 520 vs 514 will affect the decision of a school admissions adminstrator? in other words does the increase in the score have any practical significance?

Although it is not big difference, it is an improvement that has evidence. The scores are expected to be higher in average than without the review course.

D. test the hypothesis at the a=.10 level of confidence with n=350 students. assume that the sample mean is still 520 and the sample standard deviation is still 119. is a sample mean of 520 significantly more than 514? find test statistic, find p value, is the sample mean statisically significantly higher? what do you conclude about the impact of large samples on the p-value?

In this case, the z-value is

Z=\frac{520-514}{s/\sqrt{n}} =\frac{6}{119/\sqrt{350}} =\frac{6}{6.36} =0.94\\\\P(z>0.94)=0.1736>\alpha

In this case, the P-value is greater than the significance level, so there is no evidence that the review course is increasing the scores.

The sample size gives robustness to the results of the sample. A large sample is more representative of the population than a smaller sample. A little difference, as 520 from 514, but in a big sample leads to a more strong evidence of a change in the mean score.

Large samples give more extreme values of z, so P-values that are smaller and therefore tend to be smaller than the significance level.

8 0
2 years ago
Explain why all squares are similar????? and please help with question below!!!!!!!!!!!!!
Oliga [24]
That's not a squre
anyway, we use ratios
base:person to corner=28:8
height to height=x:5
so
28/8=x/5 becasue same ratio
28/8=14/4=7/2
7/2=x/5
multiply
35/10=2x/10
35=2x
divide 2
17.5=x

x=17.5 feet
5 0
3 years ago
PLEASE HELP ME GEOMETRY
Aloiza [94]
Answer is B. second choice

Segments DE and AC are parallel by construction


4 0
3 years ago
Other questions:
  • A policy for $100-deductible collision insurance for a 3-year-old full-size car with a Class 2A driver,
    9·1 answer
  • Someone help me please
    9·1 answer
  • Which part of the angle is the vertex?
    5·2 answers
  • The segments shown below could form a triangle ac-9 cb-7 ba-16
    10·1 answer
  • The relationship between the scale factor and the volume ratio is that the volume ratio is
    7·1 answer
  • Plz help asap with explanation and will get the brilliant
    6·2 answers
  • Can someone check my work if it’s right or not?
    12·2 answers
  • What is the value of the expression 5 + 6 x (5 - 2) + 9
    5·1 answer
  • What is the volume of the cone in terms of ​π ?
    10·1 answer
  • The cost, in dollars, of shipping x computers to
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!