00 wper user from Bome.11eusers yielded a sample mean of 42.1 visits with a standarddeviation of 5.3. At the 0.01 level of significance, can itbe concluded that this differs from the national average?Source:20. AverSource: New York Times Almanac.reporparticsizes15. Cell Phone Bills The average monthly cell phone billwas reported to be $50.07 by the U.S. Wireless Industry.Random sampling of a large cell phone company foundthe following monthly cell phone charges (in dollars):655.8349.8862.9870.4260.4752.4549.2050.02At o58.6051.29the rAt the 0.05 level of significance, can it be concludedthat the average phone bill has increased?SourcSource: World Almanac.21. Docaver16. Teaching Assistants' Stipends A random sample ofstipends of teaching assistants in economics is listed. Isthere sufficient evidence at the a 0.05 level to con-clude that the average stipend differs from $15,000? Thestipends listed (in dollars) are for the academic year.A rethes14,00018,00012.000

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Asked Nov 8, 2019
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Question 15 is what I am struggling with. Please help, thank you. 

00 w
per user from Bome.
11e
users yielded a sample mean of 42.1 visits with a standard
deviation of 5.3. At the 0.01 level of significance, can it
be concluded that this differs from the national average?
Source:
20. Aver
Source: New York Times Almanac.
repor
partic
sizes
15. Cell Phone Bills The average monthly cell phone bill
was reported to be $50.07 by the U.S. Wireless Industry.
Random sampling of a large cell phone company found
the following monthly cell phone charges (in dollars):
6
55.83
49.88
62.98
70.42
60.47
52.45
49.20
50.02
At o
58.60
51.29
the r
At the 0.05 level of significance, can it be concluded
that the average phone bill has increased?
Sourc
Source: World Almanac.
21. Doc
aver
16. Teaching Assistants' Stipends A random sample of
stipends of teaching assistants in economics is listed. Is
there sufficient evidence at the a 0.05 level to con-
clude that the average stipend differs from $15,000? The
stipends listed (in dollars) are for the academic year.
A re
thes
14,000
18,000
12.000
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00 w per user from Bome. 11e users yielded a sample mean of 42.1 visits with a standard deviation of 5.3. At the 0.01 level of significance, can it be concluded that this differs from the national average? Source: 20. Aver Source: New York Times Almanac. repor partic sizes 15. Cell Phone Bills The average monthly cell phone bill was reported to be $50.07 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the following monthly cell phone charges (in dollars): 6 55.83 49.88 62.98 70.42 60.47 52.45 49.20 50.02 At o 58.60 51.29 the r At the 0.05 level of significance, can it be concluded that the average phone bill has increased? Sourc Source: World Almanac. 21. Doc aver 16. Teaching Assistants' Stipends A random sample of stipends of teaching assistants in economics is listed. Is there sufficient evidence at the a 0.05 level to con- clude that the average stipend differs from $15,000? The stipends listed (in dollars) are for the academic year. A re thes 14,000 18,000 12.000

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Expert Answer

Step 1

The hypotheses are given below:

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Null hypothesis: H 50.07 Alternative hypothesis: H 50.07

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Step 2

Decision rule:

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If p-value> a, then reject the null hypothesis.

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Step 3

Step by step procedure to obtain the test statistic using MINITAB software is given below:

  • Choose Stat > Basic Statistics > 1-Sample t.
  • In One or more samples, each in a column, select Charges.
  • Check Options, enter Confidence level as 95.
  • In Perform Hypothesis test, enter 07 Under Hypothesized mean.
  • Choose Mean > Hypothesiz...
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One-Sample T: Charges Descriptive Statistics Mean StDev SE Mean 95% Lower Bound for u 2.2 10 56.11 6.97 52.07 : mean of Charges Test Null hypothesis H: μ 50.07 Alternative hypothesis H1: p > 50.07 T-Value P-Value 2.74 0.011

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Hypothesis Testing

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