In a sample of 500 early evening students taking math classes, 312 reported work

Question

In a sample of 500 early evening students taking math classes, 312 reported working full time as well. At the 90% confidence level what is the error bound for the confidence interval for the true proportion of early evening students who work full time? 0.04 0.08 0.59 0.62 Interpret that confidence interval calculated in question 6. 90% of confidence intervals constructed this way contain the true population parameter. 90% of the data is in the interval. The sample statistic is 90% of the population parameter. 90 is the percentile of the parameter. A random sample of 20 electronics store cash register sales had a sample mean of $65.45 and standard deviation of $3.91. Which of these techniques will help to reduce on error bound for a confidence interval of the true average in a future survey? Increase the sample size. Increase the confidence level. Increase the confidence interval. All of the above A variable with unknown distribution has mu and sigma. If samples of size 100 are drawn, which of the following about the distribution of sample averages must be FALSE? The distribution will be normal. The standard deviation will be smaller. The average will be larger. When would the student-t distribution be used instead of the normal distribution for constructing confidence intervals? When the sample size is large When the population average is not known When the population standard deviation is not known All of the above Suppose the weights of students' backpacks are uniformly distributed between 5 and 19 pounds. What is the probability that a randomly selected backpack will weigh between 7 and 11 pounds? 0.4286 0.5714 0.3333 0.2857 What is the probability a randomly selected backpack will weigh more than 16 pounds given the backpack weighs more than 10 pounds? 333 0.2143 0.7857 0.5555 What is the probability 10 randomly selected backpacks average weight is more than 16 pounds

Explanation / Answer

8. All of the above

9. the standard deviation will be smaller

10. C. when the population standard deviation is not known.

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