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
True [87]
3 years ago
14

100 people at dinner. 90 had French heritage, 80 had English heritage, and 75 had Native American heritage. At least how many ha

d heritage from all theee cultures?
Mathematics
2 answers:
mixer [17]3 years ago
8 0
Its 45 XD 245-100 = 45 >:)
Marina CMI [18]3 years ago
7 0
At least there should be 245 people at dinner if u add 80,90, and 75
You might be interested in
keiko has bought 36pounds of dog food, she feed the dog 3/4 pound of food each meal. how many meals would this last
exis [7]

Answer:

48 meals

Step-by-step explanation:

36lbs ÷ 3/4lbs = 48

5 0
3 years ago
What is -0.75 - (-2/3) +0.4 + (-3/4) =
liberstina [14]

Answer:

-0.43

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
ABCD is a rhombus. Find AC​
jolli1 [7]
ABC my as I don’t know
6 0
3 years ago
A sample of 200 observations from the first population indicated that x1 is 170. A sample of 150 observations from the second po
igor_vitrenko [27]

Answer:

a) For this case the value of the significanceis \alpha=0.05 and \alpha/2 =0.025, we need a value on the normal standard distribution thataccumulates 0.025 of the area on each tail and we got:

z_{\alpha/2} =1.96

If the calculated statistic |z_{calc}| >1.96 we can reject the null hypothesis at 5% of significance

b) Where \hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{170+110}{200+150}=0.8  

c)z=\frac{0.85-0.733}{\sqrt{0.8(1-0.8)(\frac{1}{200}+\frac{1}{150})}}=2.708    

d) Since the calculated value satisfy this condition 2.708>1.96 we have enough evidence at 5% of significance that we have a significant difference between the two proportions analyzed.

Step-by-step explanation:

Data given and notation    

X_{1}=170 represent the number of people with the characteristic 1

X_{2}=110 represent the number of people with the characteristic 2  

n_{1}=200 sample 1 selected  

n_{2}=150 sample 2 selected  

p_{1}=\frac{170}{200}=0.85 represent the proportion estimated for the sample 1  

p_{2}=\frac{110}{150}=0.733 represent the proportion estimated for the sample 2  

\hat p represent the pooled estimate of p

z would represent the statistic (variable of interest)    

p_v represent the value for the test (variable of interest)  

\alpha=0.05 significance level given  

Concepts and formulas to use    

We need to conduct a hypothesis in order to check if is there is a difference between the two proportions, the system of hypothesis would be:    

Null hypothesis:p_{1} = p_{2}    

Alternative hypothesis:p_{1} \neq p_{2}    

We need to apply a z test to compare proportions, and the statistic is given by:    

z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}   (1)  

a.State the decision rule.

For this case the value of the significanceis \alpha=0.05 and \alpha/2 =0.025, we need a value on the normal standard distribution thataccumulates 0.025 of the area on each tail and we got:

z_{\alpha/2} =1.96

If the calculated statistic |z_{calc}| >1.96 we can reject the null hypothesis at 5% of significance

b. Compute the pooled proportion.

Where \hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{170+110}{200+150}=0.8  

c. Compute the value of the test statistic.                                                                                              

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.    

Replacing in formula (1) the values obtained we got this:    

z=\frac{0.85-0.733}{\sqrt{0.8(1-0.8)(\frac{1}{200}+\frac{1}{150})}}=2.708    

d. What is your decision regarding the null hypothesis?

Since the calculated value satisfy this condition 2.708>1.96 we have enough evidence at 5% of significance that we have a significant difference between the two proportions analyzed.

5 0
3 years ago
The price of a car increased by 7% which expression can be used to calculate the new price of the car
julsineya [31]

Answer: P * ( 1 + 7%)

Step-by-step explanation:

You included no options but the expression should go something like this:

Pn = P * ( 1 + 7%)

Where Pn is the new price

P is the current price

<em>The above formula will show the new price given the current price. </em>

6 0
3 years ago
Other questions:
  • If the area of a square is 1 square meter, how many centimeters long is each side?
    7·1 answer
  • The point (0,5) is reflected in the line y=x. what are the coordinates of the transformed point?
    15·1 answer
  • Please help me I need this for tomorrow!!!
    8·1 answer
  • I got g=(3d-2)^2-5 <br><br> Simplified : g=9d-1<br><br> Did I get it correct?
    13·2 answers
  • Graph the equation x+4y=12 by plotting points.
    15·1 answer
  • Find an expression which represents the sum of (-5x + 10) and (-7x + 9) in<br> simplest terms.
    14·1 answer
  • HELP, please!! What is the area of a trapezoid ABC?
    7·2 answers
  • PLEASE HELPPP!!!
    8·1 answer
  • Memorial Hospital states that the minimum payment it will accept is $50 or 15% of the account,
    12·1 answer
  • A house has decreased in value by 34% since it was purchased. If the current value is $165,000, what was the value when it was p
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!