1. The mean amount spent by a family of four on food is $500 per month with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?0.11510.03620.87500.21582. As the size of the sample increases, what happens to the shape of the distribution of sample means?It cannot be predicted in advance.It is negatively skewed.It approaches a normal distribution.It is positively skewed.3. What is the following table called?Ages    Number of Ages20 up to 30    1630 up to 40    2540 up to 50    5150 up to 60    8060 up to 70    2070 up to 80    8Frequency polygonFrequency distributionHistogramCumulative frequency distribution4. How is the t distribution similar to the standard z distribution?Both are continuous distributions.Both are skewed distributions.Both are families of distributions.Both are discrete distributions.5. In a distribution, the second quartile corresponds with the __________.MedianVarianceMeanMode6. A random sample of 85 supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?6.99 and 7.996.14 and 6.864.15 and 7.156.49 and 7.49x±z(S/n)x±z(s/√(n))7. Incomes of 50 loan applicants are obtained. Which level of measurement is income?OrdinalNominalRatioInterval8. Which of the following is an example of a continuous variable?Zip codes of shoppers.Number of students in a statistics class.Tons of concrete to complete a parking garage.Rankings of baseball teams in a league.9. For the normal distribution, the mean plus and minus two standard deviations will include about what percent of the observations?99.7%68%50%95%10. The main purpose of descriptive statistics is to:Summarize data in a useful and informative manner.Determine if the data adequately represents the population.Make inferences about a population.Gather or collect data.11. Which of the following is true regarding the normal distribution?The points of the curve meet the x-axis at z = -3 and z = 3.It is asymmetrical.It has two modes.The mean, median, and mode are all equal.12. What is the relationship among the mean, median, and mode in a symmetric distribution?The mean is always the smallest value.They are all equal.The mean is always the largest value.The mode is the largest value.13. The probability distribution for the number of automobiles lined up at a Lakeside Olds dealer at opening time (7:30 a.m.) for service is:Number    Probability1    0.052    0.303    0.404    .25On a typical day how many automobiles should Lakeside Olds expect to be lined up at opening time? Use expected value or mean of the probability distribution.2.851.0010.001.96 14. Which of the following is a point estimate for the population mean (µ)?X”x/nsσ 15. When all the items in a population have an equal chance of being selected for a sample the process is called _________________.Simple random samplingZ-scoreNon-probability samplingSampling error16. A student was interested in the cigarette smoking habits of college students and collected data from an unbiased random sample of students. The data is summarized in the following table: Males who smoke    20 Males who do not smoke    30 Females who smoke    25 Females who do not smoke    50What type of chart best represents relative class frequencies?Pie chartScatter plotFrequency polygonBox plot17. A listing of all possible outcomes of an experiment and their corresponding probabilities of occurrence is called a ____________.Probability distributionRandom variableFrequency distributionSubjective probability18. The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical bell-shaped distribution. The arithmetic mean is 14.0 inches,week-7.1,Information Systems,,

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