document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1075890>Question 1075890</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Updated questions with added information: \r<BR>\n" );
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document.write( "A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2.  Assume that the variable is normally distributed.\r<BR>\n" );
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document.write( "1.  Suppose a random sample of 15 people over 55 is selected.  What is the probability that the sample mean is above 9?\r<BR>\n" );
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document.write( "2.  Suppose a random sample of 100 people over 55 is selected.  What is the probability that the sample mean will be below 7?\r<BR>\n" );
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document.write( "A study found that citizens spend on average $1950 per year on groceries with a standard deviation of $100.  Assume that the variable is normally distributed.\r<BR>\n" );
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document.write( "3.  Find the probability that a sample of 500 citizens will have a mean greater than $2000.\r<BR>\n" );
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document.write( "I also need help with these.\r<BR>\n" );
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document.write( "Use the chi-squared distribution to test the hypothesis.\r<BR>\n" );
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document.write( "4)  A restaurant owner wants to see if the business is good enough for him to purchase a restaurant.  He asks the present owner for a breakdown of how many customers that come in for lunch each day and the results are as follows:  Monday - 20, Tuesday - 30, Wednesday - 25, Thursday - 40 and Friday - 55.  The prospective owner observes the restaurant and finds the following number of customers coming for lunch each day:  Monday- 30, Tuesday - 15, Wednesday- 7, Thursday 40, and Friday - 33.  At a 95% confidence level determine whether the present owner reported the correct number of customers for lunch each day.\r<BR>\n" );
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document.write( "find the critical value.\r<BR>\n" );
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document.write( "5.  There is an annual hot dog eating contest in Plattsburg, MS and the average number of hot dogs eaten by one person is 36 with a standard deviation of 6.  Find the critical value for a person who can eat more than 2 deviations above the mean.\r<BR>\n" );
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document.write( "6.  A company found that 27 out of 150 of its products were defective after retraining its employees.  If the company normally has a 40% defective product rate, find the critical value to determine if retraining the employees helped to minimize the number of defective products.\r<BR>\n" );
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document.write( "7.  A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6.  She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8.  Find the critical value to determine whether or not the study guide helped students to increase their test score. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #690664 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52778)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=690664\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
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