Question

Question 4 [25]

The Zambezi car battery manufacturer claims that the average lifespan of batteries produced by his firm is at least 30 months. The rival manufacture the Rehoboth batteries disagree and took random sample of 100 Zambezi car batteries and recorded a mean of 31.7 months and a standard deviation of 8 months. (Show all your works)

Determine the following:

a) The null and alternative hypotheses 3

b) The test statistic value. 5

c) The critical statistics value at 99% confidence level

d) The rejection region using critical value approach

e) The p value at 99% confidence level 5Marks

f) The rejection region using both the p value approach 2

g) Make conclusion about the population mean using both approaches 3

Answer #1

Question 4 [25]
The Zambezi car battery manufacturer claims that the average
lifespan of batteries produced by his firm is at least 30 months.
The rival manufacture the Rehoboth batteries disagree and took
random sample of 100 Zambezi car batteries and recorded a mean of
31.7 months and a standard deviation of 8 months. (Show all your
works)
Determine the following: a) The null and alternative hypotheses 3
b) The test statistic value. 5 c) The critical statistics value at...

The Zambezi car battery manufacturer claims that the average
lifespan of batteries produced by his firm is at least 30 months.
The rival manufacture the Rehoboth batteries disagree and took
random sample of 100 Zambezi car batteries and recorded a mean of
31.7 months and a standard deviation of 8 months. (Show all your
works) Determine the following: a) The null and alternative
hypotheses 3 b) The test statistic value. 5 c) The critical
statistics value at 99% confidence level...

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Perform a hypothesis test at the...

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A claim is made that the average salary for all jobs in
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using α=0.05 and assume that your
data is normally distributed and the population standard
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known.
a. Write the null and alternative hypotheses
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1. A city official claims that the proportion of all commuters
who are in favor of an expanded public transportation system is
50%. A newspaper conducts a survey to determine whether this
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they support an expanded public transportation system. Test the
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2. A survey of 225 randomly chosen commuters are asked...

The Business Case for Agility
“The battle is not always to the strongest, nor the
race to the swiftest, but that’s the way to bet
’em!” —C. Morgan Cofer
In This Chapter
This chapter discusses the business case for Agility,
presenting six benefits for teams and the enterprise. It also
describes a financial model that shows why incremental development
works.
Takeaways
Agility is not just about the team. There are
product-management, project-management, and technical issues beyond
the team’s control. Lean-Agile provides...

Delta airlines case study
Global strategy. Describe the current global
strategy and provide evidence about how the firms resources
incompetencies support the given pressures regarding costs and
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issues in their global strategy?
casestudy:
Atlanta, June 17, 2014. Sea of Delta employees and their
families swarmed between food trucks, amusement park booths, and
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