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Basic Statistics Exam [#permalink]
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23 Aug 2012, 00:29
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1. From the data types below which one is an attribute data type ? A lengths of time in the car B Battery Life (in hours) of a cellular phone battery C Diameter of pencils D Salaries of employees E The number of good and bad products
2. An individual is reviewing a stable, normal process that has a Cp=3 and Cpk=.5. In order to achieve a capable process, what must be done ? A Not enough information given B Shift the mean only C Reduce variation only D it is already a capable process E Reduce variation and shift the mean
3. When population data are discrete and you want to compare two populations, which test is most appropriate ? A Levene’s B ttest C 2Proportion Test D AndersonDarling E Ftest
4. Which one of the following statistical test is used to compare five means, simultaneously ? A OneWay ANOVA B 2 Sample Ttest C Run Test D FTest E Normality test
5. Which test determines if there is a difference between the mean of a group and a proposed standard value ? A Paired ttest B Two sample ttest C F test D Onesample ttest E One way Anova
6. While testing a statistical hypothesis with a significance level of alpha 0.05. when do you reject the NULL hypothesis (HO) ? A When P=value is less than 0.05 B When P=value is between 0.1 and 0.5 C When P=value is equal to 0.5 D When P=value is larger than 0.5 E When P=value is larger than 0.95
7. Which of the following is true about Standard Deviation A It is the average B It is a range of values C It measures location D It is measure of spread E It is maximum value minus the minimum value
8. What statistical assumptions need to be validated for ANOVA results to be valid ? A Observations are selected, not randomized B No assumptions are required to be met C Observations are normally distribute, independent, a variance are equal D Observations are from an Fdistribution E Observations are from a Chi square distribution
9. Which of the following statements correctly interprets a 95% confidence interval on a population mean ? A It is a single point estimate B A 99% confidence interval is narrower than the 95% confidence interval C It is not used to interpret the population D If we repeatedly took sample from the same population, 95% of them would contain the true population mean. E Used to quantify the certainty of the sample standard deviation
10. The null hypothesis is ? A Not Needed B Always contains a > in the equation C The hypothesis of no difference D the alternative hypothesis E Always contains a < in the equation.
