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Determining the confidence interval

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Reference no: EM131210925

1. The Director of Golf for a local course wants to study the number of rounds played by members on weekdays. He gathered the sample information shown below for 520 rounds. At the .05 significance level, is there a difference in the number of rounds played by day of the week?

Day

 Rounds

 Monday

 124

 Tuesday

 74

 Wednesday

 104

 Thursday

 98

 Friday

 120
  • No, because χ2= 7.715
  • Yes, because χ2= 15.308
  • Yes, because χ2= 12.288
  • No, because χ2= 11.793

2. A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week.  A sample of 64 smokers revealed that = $20 and S = $5.  What is the 95% confidence interval for μ? 

  • $18.78 to $21.23
  • $18.60 to $21.40
  • 18.16 to 21.84
  • 18.37 to 21.63

Reference no: EM131210925

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