known use z-value
#9
Consider the following hypothesis test:
H0: 20
One-Tailed Test:
Lower Tail Test
Ha: < 20
a)
=2
n = 50
= 19.4
Compute the value of the test statistic.
Use z-value b/c = 2
z = - 0 / /n
z*= 19.4 - 20 / 2/50 =
b)
c)
d)
-2.12132
What is
Question #3: Consider a sample with data values of 27, 25, 20, 15, 30, 34, 28, and 25. Compute the 20th, 25th, 65th, and 75th percentiles.
Manual Work:
Arrange Data in Asscending order:
27
25
25
20
15
30
34
28
15
20
25
25
27
28
30
34
(a) For the 20th perc
These probabilities can be obtained using Excels NORM.S.DIST function or the standard normal
probability table in the text.
#10
a. P(z 1.5) = .9332 =NORM.S.DIST(1.5,TRUE)
0.933193
b. P(z 1.0) = .8413 =NORM.S.DIST(1,TRUE)
0.841345
c. P(1 z 1.5) = P(z 1.5)
Question #7: The probability distribution fot the random variable x follows.
x
20
25
30
35
Sum
f(x)
0.20
0.15
0.25
0.40
1.00
a. Yes, this probability distribution is valid because it satisfies 2 equations 1) f(x) 0 and (2) f(x)=1, where the probabilities
HW Assignment - Chapter 8
#1
Purchases
Sales
Quantity: Unit Cost:
Quantity:
June 1 (Balance on hand)
2,000
$10.00 June 5
500
June 2
1,500
10.05 June 8
1,600
June 7
600
10.50 June 9
700
June 15
900
11.00 June 18
1,800
June 20
1,200
11.00 June 30
700
June 2
HW 1 (Recording Bad Debts)
Bad Debt Expense = (Credit Sales -Sales Returns & Allowances) x Est. Bad Debt %
Bad Debt Expense =
212500
3.0%
6375
Adjusting Entry:
(a)
Dec. 31 201X
ADA
Bad Debt Expense
6375
500
ADA
6375
6375
6875
(b)
ADA
500
1500 Adj. Entry
2