What type of graph depicts the data below ANS Line chart What proportion of the data from a normal distribution is within two standard deviations from the mean 0 9544 What number corresponds to t0 05 10 1 812 What number corresponds to 21 00 What number corresponds to F0 95 4 8 0 166 What number corresponds to F 025 3 5 7 76 What does the length of each line of a stem and leaf display represent ANS The number of observations in the interval represented by that stem What values are displayed on a cumulative relative frequency distribution ANS The proportion of observations that fall below each class interval Values must represent ordered rankings for what type of data ANS Ordinal data 2 1 How do confidence levels compare to significance levels ANS Confidence levels are typically large and significant levels are typically small Given the least squares regression line of 0 81 the coefficient of correlation is 0 90 and a coefficient of determination Given the least squares regression line 0 81 the coefficient of correlation is 0 90 and a coefficient of determination of Given that Z is a standard normal random variable the area to the left of a value z is expressed as P Z z Given that Z is a standard normal variable the variance of Z is always equal to 1 0 Given a Poisson random variable X where the average number of successes occurring in a specified interval is 1 8 then P X 0 is 0 1653 Given the information that should be used in the pooled variance t test is 38 the number of degrees of freedom Given that X is a binomial random variable with very large n the binomial probability P X 5 is approximated by the area under a normal curve to the right of4 5 Given that X is a binomial random variable with very large n the binomial probability P X 5 is approximated by the area under a normal curve to the left of5 5 Given that Z is a standard normal variable the variance of Z is always equal to 1 0 Given that Z is a standard normal random variable a negative value z on its distribution would indicate z is to the left of the mean Generally speaking if two variables are unrelated as one increases the other shows no pattern the covariance will be A positive or negative number close to zero Using a confidence interval when conducting a two tail test for we do not reject H0 if the hypothesized value for falls between the LCL and UCL Under what condition s does the test statistic for p have an approximate normal p are both 5 distribution When np and n 1 We have created a 95 confidence interval for with the result 8 13 What conclusion will we make if we test H0 15 vs H1 15 at 0 05 Reject H 0 in favor of H 1 We have created a 95 confidence interval for with the results 10 25 What conclusion will we make if we test H0 26 vs H1 26 at 0 025 information given We cannot tell from the We have created a 90 confidence interval for with the result 25 32 What conclusion will we make if we test H0 28 vs H1 28 at 0 10 H 1 Fail to reject H 0 in favor of We cannot commit a Type I error when the null hypothesis is false TRUE FALSE A grocery store s monthly sales in thousands of dollars for the last year were as follows A histogram should be used to present these data ANS FALSE Month 1 2 3 4 5 6 7 8 9 Sales 78 74 83 87 85 93 100 105 103 10 89 11 78 12 94 TRUE FALSE Time series data are often graphically depicted on a line chart which is a plot of the variable of interest over time ANS TRUE TRUE FALSE A line chart is created by plotting the values of the variable on the vertical axis and the time periods on the horizontal axis ANS TRUE TRUE FALSE The graph below represents a line graph FALSE TRUE FALSE The line chart below shows pepper prices each month from January month 1 to December last year per pound By looking at this chart you can see the lowest pepper prices occurred in July TRUE TRUE FALSE The line chart below shows pepper prices fluctuated from 2 00 per pound to over 4 50 per pound during the year TRUE TRUE FALSE A line chart that is flat shows no fluctuation in the variable being presented TRUE The value for a 95 confidence interval estimate for a population mean is1 96 The average score for a class of 30 students was 75 The 20 male students in the class averaged 70 The 10 female students in the class averaged 85 The bar charts below summarize data collected on 100 adults regarding gender and pet ownership Which of the following statements is are true based on this chart Gender and pet ownership are related a higher percentage of females own pets than males The critical values z or z 2 are the boundary values for the rejection region s The collection of all possible outcomes of an experiment is called SAMPLE SPACE The collection of all possible events is called A SAMPLE SPACE The confidence level of a statistical inference measures ANS The proportion of times an estimation procedure will be correct in the long run The classification of student major accounting economics management marketing other is an example of a n ANS Nominal random variable 2 1 The classification of student class designation freshman sophomore junior senior is an example of a n ANS Ordinal Random variable 2 1 The confidence interval estimate of the expected value of y for a given value x compared to the prediction interval of y for the same given value of x and confidence level will be narrower The covariance of two variables X and Y can be any real number The difference between a sample mean and the population mean is called SAMPLING ERROR The denominator in the calculation of the sample covariance cov x y is n 1 The Dean of Students from a large university mailed a survey to 500 students selected at random The sample was designed to include 125 students randomly selected from each of the freshman sophomore junior and senior classes on campus What sampling method was used STRATIFIED RANDOM SAMPLE The expected value E X of a binomial probability distribution with n trials and probability p of success is np The expected number of heads in 100 tosses of an unbiased coin is 75 The exponential density function f x approaches zero as x approaches infinity The expected value of the sampling distribution of the sample mean mean for all populations equals the population The Empirical Rule states that the approximate percentage of measurements in a data set providing that the data set has a bell shaped distribution that fall within two standard deviations of …