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
qwelly [4]
3 years ago
15

We want to use this information to determine if there is an effect of friendship. In other words, is the mean price when buying

from a friend the same as (or different from) the mean price when buying from a stranger? Assume the two groups have the same population standard deviation, and use significance level 0.05. Suppose that mu1 is the true mean price when buying from a friend and mu2 is the true mean price when buying from a stranger. (a) What are the null and alternative hypotheses?
Mathematics
1 answer:
saw5 [17]3 years ago
5 0

Answer:

H0 : mu1 = mu2

Ha : mu1 ≠ mu2

Which means

Null hypothesis H0; the true mean price when buying from a friend mu1 and the true mean price when buying from a stranger mu2 is the same/equal

Alternative hypothesis Ha; the true mean price when buying from a friend mu1 and the true mean price when buying from a stranger mu2 is different (not equal)

Step-by-step explanation:

The null hypothesis (H0) tries to show that no significant variation exists between variables or that a single variable is no different than its mean(i.e it tries to prove that the old theory is true). While an alternative Hypothesis (Ha) attempt to prove that a new theory is true rather than the old one. That a variable is significantly different from the mean.

Therefore, for the case above;

H0 : mu1 = mu2

Ha : mu1 ≠ mu2

Which means

Null hypothesis H0; the true mean price when buying from a friend mu1 and the true mean price when buying from a stranger mu2 is the same/equal

Alternative hypothesis Ha; the true mean price when buying from a friend mu1 and the true mean price when buying from a stranger mu2 is different (not equal)

You might be interested in
EXPERTS CALLING IN ALL EXPERTS.
bonufazy [111]

brainly won't let me type my answer out so i'll just put it in the comments, sorry if it's inconvenient.

8 0
3 years ago
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach
nlexa [21]

Answer:

A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that \mu = 130, \sigma = 30

What score is necessary to reach the 75th percentile?

This is X when Z has a pvalue of 0.75, so X when Z = 0.675.

Z = \frac{X - \mu}{\sigma}

0.675 = \frac{X - 130}{30}

X - 130 = 0.675*30

X = 150.25

A score of 150.25 is necessary to reach the 75th percentile.

7 0
3 years ago
Miss James has a six square-foot bulletin board in at 12 ft.² bulletin board she wants to cover both boards with index cards wit
irinina [24]
6 divided by 1/4 = 24 + 12 divided by 1/4 = 48, then 48 + 24 = 72
5 0
3 years ago
Find the distance between the following points: (0,0,0) and (-2,6,3)
marusya05 [52]

9514 1404 393

Answer:

  3.  7

Step-by-step explanation:

The distance formula applies in 3 dimensions as well as 2.

  d = √((x2 -x1)² +(y2 -y1)² +(z2 -z1)²)

  d = √((-2)² +6² +3²) = √(4 +36 +9) = √49

  d = 7

The distance between the two points is 7 units.

6 0
2 years ago
Find the inverse of the function y= -3/ x+ 4
Tomtit [17]
Y=4-3/x
y-4=-3/x
(y-4)x=-3
x(y-4)=-3
x=-3/y-4

there's you answer
7 0
3 years ago
Read 2 more answers
Other questions:
  • To estimate a population mean, the sample size needed to provide a margin of error of 3 or less with a 95% confidence when the p
    9·1 answer
  • Which are perfect cubes?
    12·2 answers
  • I CANT DO THE SPLITS ITS TERRIBLE<br><br><br><br><br><br> NOW ANSWER MY QUESTION
    9·2 answers
  • Diameter: 10 centimeters; height: 14 centimeters
    11·1 answer
  • I need help with this what would k be? Or is she correct
    6·1 answer
  • Write the slope intercept form of the equation of the line through the given point plz
    15·2 answers
  • 10. Amanda covers the outside of a box, shown in the diagram below, with
    12·1 answer
  • In a basket ball game, the Golden State Warriors make a total of 21 shots. Some shots were 2 points and some were 3 points. The
    12·1 answer
  • In Death valley, Cailfornia, the elevation is 15ft below sea level. In nearby San Diego , The average elevation is 50ft above se
    5·2 answers
  • I. Elena wants to estimate what proportion of computers produced at a factory have a certain defect. A random sample of 200 comp
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!