Effects of confidence interval

Reference no: EM1318574

Q1) Coin was flipped 60 times and came up heads 38 times.

a) At.01 level of significance, is coin biased towards heads? Illustrate your decision rule and computations.

b) Compute a p-value and interpret it?

Q2) What does confidence interval tell you? What does it mean? What 2 things can a researcher do to decrease width of a confidence interval? What are the effects?

Q3) Calculate the 95% confidence interval on population mean if sample of 1000 is taken and sample mean is found to be 15.95 and standard deviation is 4.2. Interpret interval. What does it mean?

Q4) Test to see if population mean is greater than assumed (or historical) value of 16. When a sample of 1000 was taken sample mean was calculated to be 15.95 and sample standard deviation was 4.2.

Reference no: EM1318574

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