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A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is 0.75.
Ms. Lisa Monnin is the budget director for the New Process Company. She would like to compare the daily travel expenses for the sales staff and the audit staff.
Using the above data write a hypothesis and preform an ANOVA test in excel. Test whether or not the crime rate is different in three different size cities
In a normal population with sigma=20, a random sample of size n gave X(mean)=56.53. At the 5% significance level, make a two-tailed test of the null hypothesis
If the mean and standard deviation of the serum are 1 and 0.4 then using a signifigance level of 0.05 test if the mean serum level of this group is diff
An educator believes that new reading activities in the classroom will help elementary school pupils improve their reading ability
A study was done to determine if a new diet plan would decrease weight. A random sample of 14 individuals were weighed before and after the plan
A major news network wanted to determine if there were significant regional differences in the President's approval rating (East Coast versus West Coast)
Perform a one sample z test for a population mean using the p value approach. Be sure to state the hypothese and the significance level
Preliminary data analyses indicate that applying the z-test is reasonable. Comment on the practical significance of all hypothesis tests
Erthromyacine is a drug that has been related with side effects during pregnancy. Assume that 30% of women experience side effects between the 24th and 28th
In a study of quantities of rice consumed in two different cities, a sample data looks. Sampling units were families of four, data is for a year.
Monitoring the ecological health of the Everglades-the bottom temperatures are recorded at the Garfield Bight station and the mean of 19.7 degrees C
At the Kinglet School District, the average score over the past 5 years for the math portion of the Scholastic Aptitude Test (SAT) was 511.
An item is subjected to a series of n tests (example: hardness, weight, length, etc.). Two known constants are associated with carrying out the ith test
5 patients have a mean diastolic blood level of 95 are recruited for a study one month long. After one month the observed mean decline in diastolic blood
Suppose the state department of real estate conducts a study of the number of first-time applicants who are successful in passing the state certification
A sample of 25 households in Prolific City revealed a mean of 7.5 residing members and a standard deviation of 3. If the mean household size for the nation
Nitrogen and Seagrass. The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem.
Choose a hypothesis and operationally define a variable in the hypothesis. Your operational definition will consist of measures at the self-report, behavioral
A variable of two populations has a mean of 40 and a standard deviation of 12 for one of the populations and a mean a of 40 and a standard deviation
The standard deviation of the breaking strengths of certain cables produced by a company is given as 240 pounds. After a change was introduced in the process
The wages for middle managers in a certain industry are thought to be no more than $45,000.00. A wage survey of 30 managers has a mean income of $46,260.00
The power of a test is measured by its capability of
A researcher had the idea that background music might enhance performance on a math test and that the effect of music might depend