I am having a statistic online quiz1hour duration1520 questions I have attached a sample test you can look atPlease make sure the accurate rate is over 75percentThank you!
.archivetempsta101___practice_questions_for_online_quiz_ii_3.docx
.archivetempsta101a___online_quiz_brief2_2.docx
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STA101A
ICMS
Practice questions for Online Quiz 2
A. Hypothesis testing I and II
1. Coles has two branches in Manly: the Corso and Darley Road branch. A manager examines whether
significantly more people buy instant, microwaveable meals at The Corso branch than at the Darley
Road branch over the last 100 days. She will use a
a. twosample ttest, for paired samples
b. twosample ttest, for independent samples (a.k.a. ttest assuming unequal variances)
c. onesample ttest
d. oneway ANOVA
2. The manager in the question above obtained from a statistical software a tcalc = 2.40 and tcritical = 1.99.
What would her conclusion be regarding the purchase of instant, microwaveable meals?
a. Reject Ho. She has evidence that significantly fewer people buy these meals from the Corso
Branch
b. Reject Ho. She has evidence that significantly more people buy these meals from the Corso
Branch
c. Keep Ho. There is no evidence that significantly more people buy these meals from the Corso
Branch
d. Keep Ho. There is no significant difference in the number of these meals bought from both
branches
3. The mean age of those attending champagne tasting events in Sydney has normally been 50 years on
average. But it seems hiphop culture has made champagne fashionable amongst very young people. An
events manager wants to investigate whether the mean age of attendees for champagne tasting events
is nowadays significantly lower than 50 years. He will use a
a. two sample ttest, for paired samples
b. two sample ttest, for independent samples
c. onesample ttest
d. oneway ANOVA
B. Confidence intervals
4. The 95% confidence interval for the population mean weight of Cadbury chocolate bars coming out of
a packing machine was estimated to be 100.25 g < µ < 100.75 g. The sample mean, ̅ , was 100.5 g. What
is the value of the margin of error, E?
5. You survey the mean weekly salary of a foodandbeverage (F&B) manager in Australian hotels. You
survey 51 hotels across Australia. Sample mean = ̅ = $2,000 per week. Sample standard deviation s =
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STA101A
ICMS
$800 per week. Assume mean salaries are normally distributed. If the relevant tscore for calculating E is
t = 2.009, what is the 95% confidence interval?
6. You created a 95% confidence interval for the number of text messages Australian students send
during class time. But the interval was too wide (E = 30 text messages). You want a narrower, precise
one, with an E = 5 text messages. How big a sample size, nnew, must you choose now?
(Previously, you used a sample size of n = 50 students. Your sample mean and standard deviation were ̅
= 55 messages and s = 30 messages).
C. Linear correlation and regression
7. If Coles wants to investigate whether ‘customer spending (in $)’ might be dependent on ‘the duration
(in minutes) people stay on their shopping website, coles.com.au’→ which might be the independent
and dependent variables?
8. You investigated the relationship between the salaries of football club managers and the number of
games the football clubs won. Is there a link between how much club managers are paid, and the
number of games won by football clubs? You obtained an r = 0.23. So what does r tell you?
9. In the question above, what is the r2 value? What does this value say about the influence of club
manager pay on number of games won?
10. There is a strong, positive relationship between the number of chocolate bars a football player eats
prior to a game, and how many goals he scores. The regression line equation from the data is G = 2 +
1.5C. G is number of goals; C is number of chocolate bars. If a soccer player eats two chocolate bars,
how many goals might he score?
D. Nonparametric statistical tests
11. You want to investigate whether there is a significant difference in the number of Facebook
messages sent by male and female students during lectures in all tertiary education institutions in
Australia. (You are interested in finding out which gender is more attentive during lectures).
You learn that the data is likely to be highly skewed (there could be a proportion of students who send
out an unusual number of Facebook messages compared to rest).
Which nonparametric statistical test is the best one to use?
a. The MannWhitney test
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ICMS
b. The sign test
c. The chisquared test
d. Spearman rank correlation
E. Chisquared test
12. You are doing a chisquared test of independence. You want to investigate whether payment
method by customers (4 categories: ‘cash’, ‘direct debit’, ‘Paypal’, and ‘bitcoin) depended on the type of
job a customer had (3 categories: ‘casual’, ‘part time’, ‘full time’). What will the degree of freedom (df)
be, when you calculate the critical chisquared value?
a.
b.
c.
d.
df = 6
df = 7
df = 5
df = 3.5
13. In the question above, what would the critical chisquared value be?
a.
b.
c.
d.
3.82
5.99
11.07
12.59
14. Which of these might involve the use of the chisquared ‘goodness of fit test’?
a. ANZ bank investigates whether for ‘Monday’ to ‘Friday’, the proportion of customers logging
into its ebanking website are all equal (20% for each of the five days)
b. ANZ bank investigates whether there is a relationship between customer occupation
(‘plumber’, ‘lawyer’ etc.) and type of service used the most (‘ebanking’, ‘walkin bank service’)
c. ANZ bank investigates whether there is a significant difference between young and old clients
when it comes to amount of transaction they make weekly (in $)
d. ANZ bank wants to investigate what the average number of transactions its customers make
daily
3
ASSESSMENT BRIEF___________________________________________________
Subject Title
Subject Code
Datainformed Decisionmaking
STA101A
Assessment Title
Learning Outcome/s
Assessment 4 → Online Quiz 2
(a) Interpret statistics to make better business decisions
(b) Interpret data graphically and numerically
Individual
20%
None
Assessment type (group or individual)
Weighting
Word count
Due week
Class submission
Submission type
Week 12 (Friday 9:30 am to Saturday 11:59 pm)
Lecture
☐
Tutorial ☐
Online
☒
Instructions
The quiz is to test the skills you acquired
from Weeks 4 to 11 – understanding the
concepts of inferential statistics and
knowing how to apply them. It also tests the
MS Excel skills you learnt during that period.
No. of questions

Between 15 and 20 (see quiz link on
Moodle when the quiz becomes
available for the final figure)
Time

Opens at 9:30 am, Friday of Week
11
Closes at 11:59 pm, Saturday of
Week 11 (one minute before
Sunday)
Duration

Between 1 to 1 hour and 20 minutes,
depending on no. of questions (see
quiz link on Moodle when the quiz
becomes available for duration)
Location

You can do this quiz from anywhere
(e.g., from home, the college)
Attempts
Page 1 of 3
ASSESSMENT BRIEF___________________________________________________



You will have only one attempt; once
you begin the quiz, you must
complete it
You can attempt the quiz at any time
between the opening and closing
times mentioned above
After completing your attempt,
please make sure you submit the
quiz
Tools

You may use a calculator, if you
wish. But you will certainly need a
notebook and pen, and a
laptop/desktop computer with the
latest MS Excel, connected to a
reliable Internet and power source.

Without these, you may fail to submit
your quiz. Failure to satisfactorily
submit your quiz will mean you get a
0% mark. You will not be allowed to
do it again.
How to prepare



Attempt the practice quiz questions.
Find them in Moodle >
Assessments
Attempt all the weekly exercise
sheets available on Moodle
Attempt all the weekly Excel inclass
practices, and challenge document
available on Moodle
Peruse your lecture slides and the
notes you took in class
Carefully see your weekly ‘before
class’ readings and viewings (e.g.,
those on ‘presentation tips’).
Warning
– No plagiarism. Do the quiz
individually. You cannot collaborate
with any student, receive help
from, give help to, or copy the
quiz attempts of others. Don’t
share the quiz questions and
answers with others.
–
Report the above misconducts to
your lecturers. With evidence of
copying (e.g., Moodle quiz data) or
reasons to believe you copied, your
lecturer has the right to penalise
you (e.g., giving you a fail).
Plagiarism is a serious offence.
Page 2 of 3
ASSESSMENT BRIEF___________________________________________________
–
Stay healthy for the quiz. Claims of
illness, family problems etc. without
strong evidence will be rejected.
Page 3 of 3
…
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