the planet is so close to its star that any water would be turned to _____ (蒸汽).
技术功和膨胀功的关系为： 。
稳定流动能量方程式，用于换热器时，通常下面那些项可以忽略？
着装具有一定规则性，国际通用的tpo原则主要是包括哪三个要素？
what we have to do is make sure we know what these are and take into _____ (考虑到) all the possible variables. about national economies.
ernest hemingway’s adventurous lifestyle and his public image brought him admiration from later generations, and he won the nobel prize in literature in 1954.
yemen _____ (控制) the strait at the southern end of the red sea.
the general process of gathering, organizing, summarizing, yzing, and interpreting data to assist in making effective decisions is called:
a sample is:
the main purpose of inferential statistics is to:
to study the characteristics of loan applicants, a random sample of 50 loan applicants is selected and their annual incomes are obtained. which level of measurement is annual income?
the main purpose of descriptive statistics is to:
a bank asks customers to evaluate the quality of drive-through service as good, average, or poor. which level of measurement is used to measure service quality?
the main purpose of descriptive statistics is to:
gallup political polls ask people their political party affiliation - democrat, republican or independent. which level of measurement is used to measure party affiliation?
what type of variable is: number of car accidents reported in your city?
data measured with an ordinal scale:
in a frequency distribution the classes must:
for a frequency distribution, the class interval is:
for a frequency distribution, a class frequency is:
for a frequency distribution, the class midpoint is:
which of the following is not a guideline for a frequency distribution?
to convert a frequency distribution to a relative frequency distribution:
the difference between a histogram and a frequency polygon is:
in a cumulative frequency polygon:
a key difference between calculating the sample mean and the population mean is:
which of the following measures of central location is affected most by extreme values?
the empirical rule states that:
which measure of central tendency reports the value that occurs with the highest frequency?
an example of chebyshev's theorem is:
in comparing two different samples of 100 observations, sample "a" has a mean of 10 and a standard deviation of 10. the sample "b" has a mean of 10 and a standard deviation of 50. the two samples are:
for a distribution, the mean is 5, the median is 15, and the mode is 20. based on this information, the distribution is:
in a positively skewed distribution, which measure of central tendency is the largest?
which of the following statistics is a measure of dispersion?
what is true about the range?
a dot plot shows:
the test scores for a class of 101 students are computed. what is the location of the test score associated with the third quartile?
the test scores for a class of 50 students are computed. what is the location of the test score associated with the second decile?
to summarize a data set with a box plot:
for a data set, the interquartile range is:
for any symmetric distribution:
for a data set, the coefficient of skewness is -2.73. we conclude that:
the purpose of a contingency table is to summarize:
a scatter diagram:
contingency tables and scatter diagrams describe:
which of the following is a correct statement about probability?
probability is defined as:
two events are not independent if:
the special rule of addition is used to compute:
the general rule of addition is used to compute:
the general rule of multiplication is used to compute:
the difference between a permutation and a combination is:
data were collected on 100 students regarding their class and major. the data are summarized in the following contingency table: what is the probability of randomly selecting a sophomore or an undeclared student?
data were collected on 100 students regarding their class and major. the data are summarized in the following contingency table: what is the probability of randomly selecting an undeclared student who is a senior?
in an experiment, a random variable represents:
which of the following statements is true about a probability distribution?
which of the following is not a characteristic of a binomial distribution?
which probability distribution is applied when the probability of a success is very all?
in general, a discrete probability distribution requires that:
in a continuous probability distribution, the random variable:
for a binomial distribution with n = 15, as π changes from 0.05 toward 0.50, the distribution will become:
for any probability distribution, the expected value is:
the expected value of a binomial probability distribution with n = 10 and π = .95 is:
the variance of a binomial probability distribution with n = 10 and π = .95 is:
a simple random sample assures that:
sampling is often preferred to surveying a population because:
which of the following is a method of probability sampling?
in a simple random sample:
suppose a population consisted of 20 items. how many different samples of n = 3 are possible?
the difference between the sample mean and the population mean is called the:
for the sampling distribution of sample means, what is the relationship between the population mean and the mean of all possible sample means of size 25?
when comparing the variances of a population distribution and a sampling distribution of means from the population the:
the standard error of the mean is:
a population distribution is normal with a mean of 18 and standard deviation of 4. a sample of 16 observations is selected and a sample mean computed. what is the probability that the sample mean is more than 18?
what is the level of measurement of dress size?
a uniform distribution is defined over the interval from 2 to 8, the probability of a value more than 4 is
a data set consists of 145 observations that range from 60 to 460, the number of classes should be ( ) for a frequency distribution.
data were collected on 100 students regarding their class and major. the data are summarized in the following contingency table: the probability of randomly selecting a sophomore given he or she is an undeclared student is ( )
there are five balls with different colors which will be arranged in front of a house. how many different ways can the balls be arranged?
the jersey numbers on baseball uniforms is an example of the _______ level of measurement.
which of the following is most affected by an outlier (extreme value)?
the incomes of 50 loan applicants are obtained. which level of measurement is income?
a bank asks customers to evaluate the quality of drive-through service as good, average, or poor. which level of measurement is used to measure service quality?
which of the following measures of central location is affected most by extreme values?
an example of chebyshev's theorem is__________
a characteristic of all confidence intervals is that_____