Explain why the t-distribution has less spread as the number of degrees of freedom increases.
Answer to relevant QuestionsExplain what is meant by degrees of freedom. A simple random sample of size n = 12 is drawn from a population that is normally distributed. The sample mean is found to be x̄ = 45, and the sample standard deviation is found to be s = 14. Construct a 90% conﬁdence ...Fifty rounds of a new type of ammunition were ﬁred from a test weapon, and the muzzle velocity of the projectile was measured. The sample had a mean muzzle velocity of 863 meters per second and a standard deviation of 2.7 ...To test H0: µ = 100 versus H1: µ > 100, a simple random sample of size n = 35 is obtained from an unknown distribution. The sample mean is 104.3 and the sample standard deviation is 12.4. (a) To use the t-distribution, why ...It is suggested by college mathematics instructors that students spend 2 hours outside class studying for every hour in class. So, for a 4-credit-hour math class, students should spend at least 8 hours (480 minutes) studying ...
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