# the 15 Targest US cities?83. A report by the Gallup Poll found that a woman visits her doctor, on average, at most 5.8 times each year. A randomsample of 20 women results in these yearly visit totals3; 2; 1; 3; 7; 2; 9; 4; 6; 6; 8; 0; 5; 6; 4; 2; 1; 3; 4; 1At the a 0.05 level can it be concluded that the sample mean is higher than 5.8 visits per year?84. According to the N.Y. Times Almanac the mean family size in the U.S. is 3.18. A sample of a college math class resultedin the following family sizes:5; 4; 5; 4; 4; 3; 6; 4; 3; 3; 5; 5; 6; 3; 3; 2; 7; 4; 5; 2; 2; 2; 3; 2At a 0.05 level, is the class' mean family size greater than the national average? Does the Almanac result remain valid?Why?85. The student academic group on a college campus claims that freshman students study at least 2.5 hours per day, onaverage. One Introduction to Statistics class was skeptical. The class took a random sample of 30 freshman students andfound a mean study time of 137 minutes with a standard deviation of 45 minutes. At a = 0.01 level, is the student academicgroup's claim correct?REFERENCES9.1 Null and Alternative Hypotheses10:47 PM11/25/2019re to searchం

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Step 1

Introduction:

The null and alternative hypotheses are as follows:

H0: μ ≥ 2.5 hours, vs. H1: μ < 2.5 hours.

When the population standard deviation is unknown and the sample standard deviation must be used in a test to determine whether the true population mean is equal to a given constant, then the t-test must be used.

The test statistic is of th...

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