Chapter 6 Reading Quiz

Which of the following is NOT a descriptor of a normal distribution of a random variable? -the graph of the distribution is bell shaped -the graph is centered around the mean -the graph of the distribution is symmetric -the graph is centered around 0

a continuous random variable has a ______ distribution if its values are spread evenly over the range of possibilities

which of the following does not describe the standard normal distribution? -the graph is uniform -the graph is symmetric -the total are under the curve must equal 1 -it is a normal distribution with a mean of 0 and a standard deviation of 1

finding probabilities associated with distributions that are standard normal distributions is equivalent to

the notation P(z < a) denotes

which of the following is not true? -if values are converted to standard z-scores, then procedures for working with all normal distributions are the same as those for the standard normal distribution -a z-score is a conversion that standardizes any value from a normal distribution to a standard normal distribution -a z-score is an area under the normal curve - the area in any normal distribution bounded by some score x is the same as the area bounded by the equivalent z-score in the standard normal distribution

where would a value separating the top 15% from the other values on the graph of a normal distribution be found? -on the top of the curve -the left side of the horizontal scale of the graph -the right side of the horizontal scale of the graph - the center of the horizontal scale of the graph

what conditions would produce a negative z-score? - a z score corresponding to an area located entirely in the right side of the curve -an area in the top 10% of the graph -a zscore for a negative area - a z score corresponding to an area located entirely in the left side of the curve

complete the following statement. If you are asked to find the 85th percentile, you are being asked to find ______ -a data value associated with an area of .85 to its right -a data value associated with an area of .85 to its left -an area corresponding to a z score of -.85 -an area corresponding to a z score of .85

_________is the distribution of all values of the statistic when all possible samples of the same size n are taken from the same population

which of the following is NOT a property of the sampling distribution - the mean of the sample means is the population mean -the distribution of the sample mean tends to be skewed to the right or left - the expected value of the sample mean is equal to the population mean - the sample means target the value of the population mean

________ is the distribution of sample proportions, with all samples having the same sample size n taken from the same population

which of the following is a biased estimator? That is, which of the following does not target the population parameter? -proportion -variance -mean -median

the ______ tells us that for a population with any distribution, the distribution of the sample means approaches a normal distribution as the sample size increases

the ________ states that if, under a given assumption, the probability of a particular observed event is exceptionally small (such as less than 0.05), we conclude that the assumption is probably not correct