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
Pepsi [2]
3 years ago
12

Customers at Costco spend an average of $130 per trip (The Wall Street Journal, October 6, 2010). One of Costco's rivals would l

ike to determine whether its customers spend more per trip. A survey of the receipts of 25 customers found that the sample mean was $135.25. Assume that the population standard deviation is $10.50 and that spending follows a normal distribution. Use standard normal curve area table.A, Specify the appropriate null and alternative hypotheses to test whether average spending at the rival�s store is more than $130.B. Calculate the value of the test statistic.C. Calculate the p-value.D. Calculate the critical value
Mathematics
1 answer:
katrin [286]3 years ago
6 0

Answer:

Step-by-step explanation:

Given the following :

Average amount spent (U) = $130 per trip

Sample size (n) = 25

Sample mean (m) = $135.25

Population standard deviation (sd) = $10.50

Assume a standard distribution.

A.) Null hypothesis ; Alternative hypothesis

Hnull : U ≤ 130 ; Ha : U > 130

B.) value of test statistic :

Z = (m - U) / standard error

Standard Error = sd / sqrt(n)

Standard Error( S.E)= 10.50 / sqrt(25)

S.E = 10.50 / 5 = 2.1

Hence,

Z = (135.25 - 130) / 2.1

Z = 5.25 / 2.1

Z = 2.5

C. Calculate the p-value.

Using the p value calculator by entering the z-score above, the p value obtained is 0.0124

P value = 0.01

D. Calculate the critical value

You might be interested in
Average Daily Temperature in August
timurjin [86]

Answer:

The range for the average low temperatures for the states listed in the chart is B) 24.

Step-by-step explanation:

Low temperatures are:

56, 55, 65, 64, 55, 44, 54, 55, 68

First we put them in order from least to greatest

44, 54, 55, 55, 55, 56, 64, 65, 68

Range is maximum - minimum

68 is maximum and 44 is minimum

68 - 44 =

24

Hope this helps you! (:

-Hamilton1757

6 0
3 years ago
The area of a rectangle is 66 ft2, and the length of the rectangle is 1 ft more than twice the width. Find the dimensions of the
umka21 [38]
This is probably way overcomplicated but i cant remember how to do it
w = n
l = 2n+1
w*l = 66
n(2n+1) = 66
2n^2 + n =66
2n^2 + n - 66 = 0
using quadratic equation

n = 11/2

width = 11/2 = 5.5
length = 11 + 1 = 12
3 0
3 years ago
Somebody please help me out!
dmitriy555 [2]
Since the triangles are similar, all sides are proportional by the same scale factor.
The relationship between the bases 32 and 8 is 4 (32/8 = 4). This means that the smaller triangle need to be multiplied by a scale factor 4 to result in the bigger triangle.
This means that 4x + 12 is 4 times greater than 15.
The equation to solve for x can be written as:
4x + 12 = 4*15
Now just solve for x as u normally would
4x + 12 = 60
(Subtract twelve from both sides)
4x = 48
(Divide both sides by 4 to isolate x)
x = 12

I hope this somewhat helped :)
Was my explanation clear enough?
4 0
3 years ago
Angles A and B are located in the first quadrant such that sinA= 7/25 and cosB = 5/13. Determine the exact value for cos (A-B).
fomenos

Answer:

  204/325

Step-by-step explanation:

You can work this a couple of ways. We expect you are probably expected to use trig identities.

  cos(A) = √(1 -sin²(A)) = 24/25

  sin(B) = √(1 -cos²(B)) = 12/13

cos(A -B) = cos(A)cos(B) +sin(A)sin(B) = (24/25)(5/13) +(7/25)(12/13)

  = (24·5 +7·12)/325

cos(A -B) = 204/325

__

The other way to work this is using inverse trig functions. It is necessary to carry the full calculator precision if you want an exact answer.

  cos(A -B) = cos(arcsin(7/25) -arccos(5/13)) = cos(16.2602° -67.3801°)

  = cos(-51.1199°) ≈ 0.62769230 . . . . (last 6 digits repeating)

The denominators of 25 and 13 suggest that the desired fraction will have a denominator of 25·13 = 325, so we can multiply this value by 325 to see what we get.

  325·cos(A-B) = 204

so, the exact value is ...

  cos(A -B) = 204/325

8 0
3 years ago
What is the simplified form of the expression? 5 c squared d minus 4 c + 3 minus 3 + 2 c squared d minus 3 c + d minus 7 3 c squ
nikklg [1K]

Answer:

7 c squared d minus 7 c + 4 d minus 10

Step-by-step explanation:

because thats the answer on edge 2020 I promise :)

4 0
3 years ago
Read 2 more answers
Other questions:
  • What is an Expression similar to 3/4(5z+16)
    15·1 answer
  • Ther are 29 students in Mrs. Hernandez’s homeroom. One student will be randomly selected to act as a representative on the stude
    9·1 answer
  • working together, melissa and jing can mow a lawn in 5 hours. It would take melissa 8 hours to do the job alone. What is the val
    8·1 answer
  • An aerial photograph is taken of a building. The photograph is made when the angle of elevation of the sun is 26 degrees. The sh
    12·1 answer
  • What is the sticker price?
    8·1 answer
  • Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 5.9 parts
    7·1 answer
  • The boxplot displays the grades (out of 30) that 26 students received on a quiz.
    10·1 answer
  • Question 2
    11·2 answers
  • (5 + 42) ÷ 3 ● 6<br> I need the answer and Steps Plz
    10·1 answer
  • Sven has $1 and a dime in his pile. Dayna has 11 dimes in her pile. If Sven gives Dayna $1 and Dayna gives Sven 10 dimes, will t
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!