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The bar graph below compares the mean time in seconds for 7-yr old girls to complete a certain task to the mean time in seconds for 7-yr old boys to complete the same task. There is a statistical de
To find a Z score from the given data. An aptitude test has a mean of 220 and standard deviation of 10. Find the corresponding z score.
Assume a one-tailed t-test is being applied to find if the population mean is less than $212. The level of significance chosen is 0.01 and 26 accounts are sampled. Find out the critical value?
Utilize Chebyshev's theorem to find what percent of the values will fall between 120 and 150 for a data set with mean of 135 and standard deviation of 7.5.
To find mean, median, mode and midrange. Find out the mean, median, mode, and midrange for these data.
The mean length of the small counter balance bar is 43 millimeters. There's concern that the adjustments of machine producing the bars have changed.
What is the relationship between variance and standard deviation? What are the symbols used to represent the sample variance and standard deviation? Why is the unbiased estimator of variance used.
When a distribution is bell-shaped, in the order of what percentage of data values will fall within one standard deviation of the mean.
The line of best fit is used to predict the average value of y that can be expected to take place at a given value of x. _____ (T/F)
In order to control (and test) for Order and Sequence effects, the researcher decides to use a 3x3 Latin Square design (within-subjects). In a pilot study, five kids are given several problems of ea
A researcher wants to compare how kids solve three different types of arithmetic word problems, and to see if the order in which they experience the 3 types of problems makes a difference in how wel
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find out P81, which separates the bottom 81% from the top 19%.
A researcher chooses a random sample of college students and measures the number of hours they spend watching television per week and their grade point average.
Conduct the test of independence to determine whether employee health insurance coverage is independent of the size of company. Employ α = 0.05 level of significance.
Finding the value of percentile 90 for the given mean and third quartile Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is about normal. Find P90. (You will nee
A researcher is interested in whether social assertiveness might be influenced by training procedures. Two groups of college sophomores are randomly selected.
In a particular game a person wins $1 if they roll a 2 or a 6 on a regular cube die. The win zero (0) if they roll an off number - they win $10 if they roll a 4. What is the expected value of the ro
To find mean, standard deviation and confidence interval.Consider the following data for two independent random samples taken from two normal populations.
Mary Sue problem: Scatter Diagram, Sample Correlation Coefficient, Coefficient of determination
Draw density curves that may describe distributions with following shapes
Peanut butter problem: Calculation of Inter Quartile Range IQR. The cost of one serving of peanut butter (in cents) for a random sample of 19 jars of peanut butter was found to be.
The heights of women aged 20 to 29 are approximately normal with the mean 64 inches and standard deviation 2.7 inches. Men some age have mean height 69.3 inches with standard deviation 2.8 inches.
Black Hole Pizza Parlor instructs its cooks to put a "handful" of cheese on each large pizza. A random sample of six such handfuls was weighed.
Distribution of scores in sample: Identify the given data skewed or not. A record executive is interested in the popularity of her label's newest band, The Standard Deviations.
Find out the proportion of observation from standard normal distribution for each of following statements. In each case sketch the standard normal curve and shade area under the curve that is the an