# 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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Step 1

The hypotheses are given below:

Step 2

Decision rule:

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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