Finding tc with confidence level and sample size

Reference no: EM1318400

Q1)i) Find the t_c for a 90% confidence level with a sample size of 18.

ii) A random sample of 41 basketball players from The Official NBA Basketball Encyclopedia gave the sample standard deviation for player height as s=3.32 inches. How many more players from this encyclopedia should be included in the sample to be 99% sure that the sample mean is within 0.50 inches of the population mean of all players in this book?

iii) Use Norman's mean weight of 46.2 lbs. and standard deviation of 2.5 lbs. of flour. Determine a confidence interval for the mean weight of flour needed using a sample of 26 loaves. Use a confidence level of 90%.

iv)a) Degrees of freedom = _____.

b) Critical value = _____.

c) Value of maximal error = _____.

d) Value confidence interval = _____.

Reference no: EM1318400

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