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
FromTheMoon [43]
3 years ago
5

Which of the following is not a real number?

Mathematics
1 answer:
Aleks [24]3 years ago
3 0

Answer:

D:  √(-4)

Step-by-step explanation:

D:  √(-4) is not a real number; it's an imaginary one.

You might be interested in
95 out of 1200 randomly selected people surveyed in the u.s said they would rather watch baseball on television than go to a gam
Brums [2.3K]

Answer:

C.) go to a baseball game than watch it on television

Step-by-step explanation:

Only 7.9% of the 1200 people would rather watch a game on television than go to a game.

  • <em>That means 92% of the group would rather go to a game, instead of watching it on television.</em>

Your answer should be letter C, most people would rather go to a baseball game than watch it on television

5 0
3 years ago
Men are believed to have a slightly longer average length of short hospital stays than women; 5.2 days versus 4.5 days respectiv
Georgia [21]

Answer:

Since our calculated value is lower than our critical value,z_{calc}=2.02, we have enough evidence to FAIL to reject the null hypothesis at 1% of singificance. So there is not nough evidence to conclude that mean for men it's significantly higher than the mean for female.

Step-by-step explanation:

1) Data given and notation  

\bar X_{1}=5.2 represent the mean for group men  

\bar X_{2}=4.5 represent the mean for group women  

Assuming these values for the remaining data:

\sigma_{1}=1.2 represent the population standard deviation for the sample men

\sigma_{2}=1.5 represent the population standard deviation for the sample women

n_{1}=32 sample size for the group men  

n_{2}=30 sample size for the group women  

z would represent the statistic (variable of interest)

p_v represent the p value  

2) Concepts and formulas to use  

We need to conduct a hypothesis in order to check if the mean for men it's higher than the mean for women, the system of hypothesis would be:  

H0:\mu_{1} \leq \mu_{2}  

H1:\mu_{1} > \mu_{2}  

If we analyze the size for the samples both are higher than 30, and we know the population deviation's, so for this case is better apply a z test to compare means, and the statistic is given by:  

z=\frac{\bar X_{1}-\bar X_{2}}{\sqrt{\frac{\sigma^2_{1}}{n_{1}}+\frac{\sigma^2_{2}}{n_{2}}}} (1)  

z-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.  

3) Calculate the statistic  

We have all in order to replace in formula (1) like this:  

z=\frac{5.2-4.5}{\sqrt{\frac{1.2^2}{32}+\frac{1.5^2}{30}}}=2.02  

4) Find the critical value

In order to find the critical value we need to take in count that we are conducting a right tailed test, so we are looking on the normal standard distribution a value that accumulats 0.01 of the area on the right and 0.99 of the area on the left. We can us excel or a table to find it, for example the code in Excel is:

"=NORM.INV(1-0.01,0,1)", and we got z_{critical}=2.33

5) Statistical decision

Since our calculated value is lower than our critical value,z_{calc}=2.02, we have enough evidence to FAIL to reject the null hypothesis at 1% of significance. So there is not nough evidence to conclude that mean for men it's significantly higher than the mean for female.

6 0
3 years ago
There are 5 yellow marbles and 12 blue marbles in a bag. You randomly choose one of the marbles. What is the probability of choo
Anettt [7]
5 yellow marbles out of total of 17 marbles so 5/17
3 0
3 years ago
Read 2 more answers
In the given figure a + b + c = 295° , fins the value of a , b , c and d....​
Contact [7]

Answer:

a and c = 115 and b and d = 65

Step-by-step explanation:

Hope this helps :)

5 0
2 years ago
Read 2 more answers
Bob the wizard makes magical brooms . He charges 125 gold pieces for each magical broom he makes for his customers. He also char
ivann1987 [24]
Answer: f(x)=125g+50

Explanation: He is charging $125 for each gold piece so you would multiply “g” and 125.
You would add 50 as a one time fee so you add 50.
7 0
3 years ago
Read 2 more answers
Other questions:
  • Based on the data from six students, the regression equation relating number of hours of preparation (x) and test score (y) is .
    7·2 answers
  • Is a number 36 a perfect square and why​
    11·1 answer
  • HELP PLEASE‼️
    11·1 answer
  • the students in Mr. hardings gym class went on a class ski trip. Each student paid $25 and the school paid a total of $300. Alto
    14·2 answers
  • Can you help me with this math problem and tell me how to do it?
    15·1 answer
  • If 1/2 paint cover 1/8 of the wall,then how many quarts cover the whole wall
    11·1 answer
  • Please someone help me with this question. Worth branliest if you get it right. Thank you!
    12·2 answers
  • Please I need help it’s an emergency
    8·1 answer
  • Free poînts whats 1+1
    7·2 answers
  • The first three terms of a sequence are given. Round to the nearest thousandth (ifnecessary).3 33,2'4'Find the 8th term
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!