Question

A city officials claim that average transit usage in the city is less than 20%. Based on previous studies in different parts of the city, it is known that the share of transit is normally distributed in the city with a standard deviation of 3.5. A research group collected data for different parts of the city and ended up with 12 observations for transit usage in different parts of the city: 20, 18, 19, 16, 18, 26, 22, 19, 24, 16, 14, 17

a. Carry out an appropriate hypothesis test to examine the validity of the city officials.

b. Evaluate the claim if the assumption about the standard deviation of 3.5 is not considered.

Answer #1

Claim: Last quarter, the average home
price in Washington state was $409,228.
Do you believe, since the COVID-19 pandemic started, that home
prices have are different?
Test the claim, using a two-tail hypothesis test at the
5% significance level.
a) Gather the data.
Here is my data from Redfin:
House
Price
1
819500
2
499950
3
569000
4
220000
5
110000
6
499999
7
389900
8
399000
9
650000
10
459000
11
975000
12
749000
13
848000
14
529000
15...

The price of a share of stock divided by the company's estimated
future earnings per share is called the P/E ratio. High P/E ratios
usually indicate "growth" stocks, or maybe stocks that are simply
overpriced. Low P/E ratios indicate "value" stocks or bargain
stocks. A random sample of 51 of the largest companies in the
United States gave the following P/E ratios†.
11
35
19
13
15
21
40
18
60
72
9
20
29
53
16
26
21
14...

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they support an expanded public transportation system. Test the
official’s claim at α = 0.05.
2. A survey of 225 randomly chosen commuters are asked...

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Suppose they plan to collect a sample of 50 ball bearings and
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this manufacturing process.
The sample of size 50...

Delta airlines case study
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What tools could AA leaders have used to increase their
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???ALASKA AIRLINES: NAVIGATING CHANGE
In the autumn of 2007, Alaska Airlines executives adjourned at
the end of a long and stressful day in the
midst of a multi-day strategic planning session. Most headed
outside to relax, unwind and enjoy a bonfire
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Using the model proposed by Lafley and Charan, analyze how
Apigee was able to drive innovation.
case:
W17400
APIGEE: PEOPLE MANAGEMENT PRACTICES AND THE CHALLENGE OF
GROWTH
Ranjeet Nambudiri, S. Ramnarayan, and Catherine Xavier wrote
this case solely to provide material for class discussion. The
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