Question

John believes that two brands of AA batteries last about the same about of time. The following is the length of time (in hours) 10 batteries from each brand lasted:

Brand A | 17 | 19 | 19 | 20 | 20 | 21 | 22 | 23 | 23 | 24 |

Brand B | 18 | 18 | 18 | 18 | 19 | 19 | 20 | 20 | 20 | 21 |

What is H_{0}:

What is Ha:

What is the p-value? Round answer to three decimal places (i.e. 0.123)? Answer

At a level of significance (alpha) of 0.05, what is your decision?

reject the null hypothesis

accept the null hypothesis

fail to reject the null hypothesis

Answer #1

A consumer advocate researches the length of life between two
brands of refrigerators, Brand A and Brand B. He collects data
(measured in years) on the longevity of 40 refrigerators for Brand
A and repeats the sampling for Brand B. These data are measured in
years. (You may find it useful to reference the appropriate
table: z table or t
table)
Brand A
Brand B
Brand A
Brand B
25
21
18
19
15
15
24
19
24
15
17...

A consumer advocate researches the length of life between two
brands of refrigerators, Brand A and Brand B. He collects data
(measured in years) on the longevity of 40 refrigerators for Brand
A and repeats the sampling for Brand B. These data are measured in
years. (You may find it useful to reference the appropriate
table: z table or t
table)
Brand A
Brand B
Brand A
Brand B
23
12
21
18
22
15
17
20
18
20
20...

Scientists claim eating chocolate can improve memory. So to test
this theory 10 subjects were given a memory test in which they had
to remember 25 items with and without having eaten chocolate. The
results were as follows:
Subject
A
B
C
D
E
F
G
H
I
J
Without Chocolate
18
16
21
23
14
15
14
19
20
22
With Chocolate
20
17
23
21
16
18
13
23
22
20
What is the p-value? Round answer to...

The quality department at ElectroTech is examining which of two
microscope brands (Brand A or Brand B) to purchase. They have hired
someone to inspect six circuit boards using both microscopes. Below
are the results in terms of the number of defects (e.g., solder
voids, misaligned components) found using each microscope. Use
Table 2.
Circuit Board
Number of defects with Brand A
Number of defects with Brand B
1
12
14
2
8
9
3
16
16
4
14
12 ...

A market researcher believes that brand perception of one of the
company's products may vary between different groups. After
interviewing 278 persons, the following data was compiled. Can we
conclude that brand perception is dependent on age?
Age
Favorable
Unfavorable
Neutral
Total
18-30
50
15
17
82
30-45
45
17
16
78
Over 45
72
20
26
118
Total
167
52
59
278
Step 1 of 8 : State the null and
alternative hypothesis.
Answer
H0: brand perception and age are...

Nine experts rated two brands of coffee in a taste-testing
experiment. A rating on a 7 point scale (1 = extremely unpleasing,
7 = extremely pleasing) is given for each of four characteristics:
taste, aroma, richness, and acidity. The accompanying data table
contains the ratings accumulated over all four characteristics.
Complete parts (a) through (d) below.
EXPERT. BRAND A BRAND B
C.C. 23 24
S.E. 24 24
E.G. 19 21
B.I 21 23
C.M. 21 24
C.N 25 26
G.N...

Hw 21
A researcher wants to know if recreational screen time (that is,
screen time for entertainment purposes, rather than for school,
work, or communication) has increased or decreased since 2016. In
2016, the mean recreational screen time was 12.9 hours per week.
She collects data from 125 individuals, and finds the sample mean
recreational screen time to be 14.1 hours per week. The sample
standard deviation was 5.25 hours per week. Test her claim that the
mean amount of...

It is believed that nearsightedness affects about 8% of all
children. In a random sample of 194 children, 21 are
nearsighted.
(a) Construct hypotheses appropriate for the following question: do
these data provide evidence that the 8% value is inaccurate?
Ho: p = .08
Ha: p ≠ .08
Ho: p = .08
Ha: p > .08
Ho: p = .08
Ha: p < .08
(b) What proportion of children in this sample are
nearsighted?
(round to four decimal places)
(c)...

Suppose you want to determine whether the brand of laundry
detergent used and the temperature affects the amount of dirt
removed from your laundry. You buy two different Brand of Detergent
(A and B) and choose three different Temperature (cold, warm and
hot). Four laundry loads were washed for each combination of
detergent and temperature. The amount of dirt removed from each
load was recorded. The partial ANOVA table is given below.
Source
DF
SS
MS
F
Brand
(a)
20...

Use a t-test to test the claim about the population mean μ at
the given level of significance α using the given sample
statistics. Assume the population is normally distributed.
Claim: μ ≠ 24; α=0.10 Sample statistics: x overbar =
21.4, s = 4.2 , n equals = 11
What are the null and alternative hypotheses? Choose the
correct answer below.
A.H0: μ≠24
Ha: μ=24
B.H0: μ≤24
Ha: μ>24
C.H0: μ=24
Ha: μ≠24
D.H0: μ≥24
Ha: μ than<24...

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