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It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter mt. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the number of people who entered the bank before you. Find the expectation and the variance of X.
Determine percentage of employees has 5 dependents? Of all employees which have at least one dependent, determine percentage has more than one?
Describe a hypothesis you have related to the area of psychology in which you are predicting a correlation. What is the specific nature (direction) of the correlation and why do you think it would occur?
Determine the highest and lowest scores and calculate the range. Determine an appropriate interval size (i) for grouping data. Draw a frequency polygon from the data. Are the data normal or skewed?
Describe the sampling distribution model of this mean.
Following are speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon; Make (a) a frequency table, (b) a histogram, and (c) a frequency polygon. Then describe the general shape of the distribution.
If the researcher computes the t-statistic to be 4.2 and t-value found in t table for df=60 and level of significance of 0.5, is 2.0 researcher would accept or reject null hypothesis.
There're several measures of central tendency. By far the most frequently utilized of these measures is mean of population. Remember that the source of the data that you want to analyze always comes from what is called a population.
If an applicant is randomly selected, find the probability of a rating that is between 200 and 275.
Assuming these data are from two independent groups, calculate dfX, dfY, and dftotal for the data above. Determine the critical values for t based on the df you calculated for the question above, assuming a two-tailed test with a p level of 0.05.
An account invested in a money market fund grew from $73,329.23 to $73,627.26 in a month. What was the interest rate to the nearest tenth?
What is the relative frequency of classical CDs with a playing time of X less than 49 minutes? That is, find the relative frequency of the event X
does a follow-up reminder increase the renewal rate on a magazine subscription? a magazine sent out 760 subscription
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