A cognitive psychologist believes that a particular drug improves short-term memory. An experiment is conducted in which 8 randomly selected participants are given the drug and then given a short time to memorize a list of 10 words. Participants are then tested for retention 15 minutes after the memorization period. The number of words correctly recalled by each participant is as follows: 8, 9, 10, 6, 8, 7, 9, 7.

Over the past few years, the psychologist has collected a lot of data using this task with similar subjects. Although he has lost the original data, he remembers that the mean was 6 words correctly recalled and that the data were normally distributed.

Required:
a. On the basis of these data, what can we conclude about the effect of the drug on short-term memory? Use α = 0.05.
b. Determine the size of the effect.

Answer:

We can conclude that there is significant evidence that the drug improves short term memory.

Step-by-step explanation:

Given the sample data : 8, 9, 10, 6, 8, 7, 9, 7.

The sample mean, xbar = Σx / n

Sample standard deviation :

√Σ(x - xbar)²/ n-1)

Xbar = 8

Sample size, n = 8

Standard deviation, s = 1.31

H0 : μ = 6

H0 : μ > 6

The test statistic :

(xbar - μ) ÷ (s/√(n))

(8 - 6) / (1.31 / √8)

2 /0.4631549

Test statistic = 4.318

Decision region :

Reject H0 ; if Pvalue < α

α = 0.05

Pvalue from Tscore calculator :

df = n - 1 ; 8 - 1 =7

Pvalue(4.318, 7) = 0.001744

Pvalue < α ; We reject H0 ; and conclude that there is significant evidence that the drug improves short term memory.

Write the expression with your terms. 10x-2x

plwaseeee helppp!! plelalslsllslslz

Solve using square roots: (x-6)^2=144

A rectangle with a length of 5cm and width of 2cm is cut diagonally. What is the area of one of the triangles formed?

PLEASE LEAVE STEPS!

How many different 2 digit PIN numbers codes are possible? *

3 3/4 - 1 2/3 iready

Find the area of this figure

Robyn can rent an unfurnished apartment for $850 per month. The landlord requires first and last months' rent, plus a security deposit of $350. How much will Robyn have to pay before she can rent this apartment?

1) Which division expression is the given figure below modeling?
10 points
A) 2/3=4
B) 4 = 2/3
C) 4x2/3
D) 2/3 x 4
Figure to use with Problem #1​

The owner of a restaurant wants to collect data to find out the customers' opinions on the variety of appetizers offered on the menu. Which group should she survey to collect the best data? ANSWERRR QUCIKK A.
thirty customers who asked to share their opinions of the appetizers with the chef
B.
fifty randomly selected customers who dined at the restaurant
C.
sixty members of the local community
D.
the first fifty customers who dine at the restaurant without ordering an appetizer

rewrite 1/4 with the denominator 24​

4. For his garden, Clay has a mixture of 12
white corn seeds, 24 yellow corn seeds, and
16 bicolor corn seeds. If he reaches for a
seed without looking, what is the probability
that Clay will plant a bicolor corn seed first?

5.3 in.
8 in.
4 in.
8 in.

Khan Question :) will make brainliest <3

Click on the graph below to create a triangle with vertices at the following points.
(-5,0), (-5,9), (0,9)

I already know the answer I just need someone to explain step by step how to solve it. I need to know the process ​

$7.36 + 2.23 + 4.86

if sin= 3/4 what are the values of cos 0 and tan 0

Lexi is hiking a trail that is 7.5 miles long. She stops to take a break after hiking 3.8 miles of the trail. Which equation can be used to find how many miles, m, Lexi has left to hike

Find the volume of the cone.
Either enter an exact answer in terms of \piπpi or use 3.143.143, point, 14 for \piπpi.

Adam borrowed $16,780 at 12.5 percent for 10 years. What is his monthly payment?

A: $240.31
B: $245.83
C: $230.12
D: $229.81

What angle is this
A. Vertical
B. Adjacent
C. Supplementary
D. Complementary
Can be multiple answers ​

Which of the following shows the solution to m + 5 > -1?

LINK=REPORT

Which expression does not equal one-eight
A. (1/2)^-3
B. 2(4)^-2
C. 2^-3
D. 1/2^3


(6^4)(6^-2)=

A. 6^2
B. 6^-8
C. 12^2
D. 12^-8


Simplify (k^7)^3

A. k^-10
B. k^4
C. k^10
D. k^21


(9^5)(9^2)

A. 9^7
B. 9^10
C. 18^7
D. 18^10

If you answer the four questions and if they’re right I will give brainliest!

calculate the distance between the points J = ( -7, 6) and F = ( -1, 1 ) in coordinate plane

a bag contains 13 1/2 cups of sugar. a serving of sugar 3/4 cup. how many total servings are in the bag?

put these number least to greatest 4,3,-2,-2.5,-17,2.5,-1,2,-3,-4

( NEED HELP ASAP )
Drews fish tank measures 32 cm by 22 cm by 26 cm. He pours 20 liters of water into it, and some overflows the tank. Find the volume of water, in milliliters, that overflows.

Brie saves her $5 weekly allowance for several weeks and uses the money to buy a game for $32. She has $8 remaining. For how many weeks did Brie save her allowance

The amount of rain last month? Numerical or categorical data?