Can I have a quick information of this ( file attached)
1. A frequency distribution can be shown as
? a statistic
? a histogram
? a scatter plot
? a stem and leaf plot
2. Simple statistics are
? for simpletons
? presented in stem and leaf plots
? things like correlations
? things like standard deviations
3. What would you do with a median?
? Use it do show spread.
? Use it for normally distributed data.
? Cross it against oncoming traffic
? Indicate the middle of some data.
4. The following are measures of spread:
? standard deviation
? root mean square errors
? percentile ranges
? polyunsaturated margarine
5. Which arrow indicates the standard error of the estimate?
? A
? B
? C
? D
6. Confidence intervals...
? are a new form of sprint training.
? are calculated routinely by most stats packages.
? define the likely range of a population value.
? are inferior to p values for indicating magnitude of outcomes.
7. An outcome measured on a five-point scale (not at all to always)...
? is an example of an ordinal variable.
? has a behavior problem when it comes to residuals.
? should be analyzed by logistic regression.
? can be analyzed by ANOVA.
8. Dimension reduction
? describes loss of precision.
? describes factor analysis.
? is an example of ANOVA.
? is a weight-loss program.
9. Concerning reliability:
? It impacts most on descriptive studies.
? It can be expressed as an ICC.
? It can be expressed as a CV.
? It is quantified by 2-way ANOVA.
10. Concerning validity:
? It impacts most on descriptive studies.
? It is the correlation between true and observed values.
? A valid measure must be reliable.
? A reliable measure must be valid.
True or False: The probability of Type I error is referred to as the significance level of the test.
True
False
A Type II error is defined as:
rejecting a true null hypothesis.
rejecting a false null hypothesis.
failing to reject a true null hypothesis.
f
I need help with answering these 9 questions.
1) "ยต = 17" is an appropriate null hypothesis.
A.
True
B.
False
2) If the p-value is less than a in a two-tailed test, the null should be rejected.
A.
True
B.
False
3) A Type II error is committed when we reject a null hypothesis that is true.
A
The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars. Use these data to answer questi
Exhibit 10-11
An insurance company selected samples of clients under 18 years of age and over 18 and recorded the number of accidents they had in the previous year. The results are shown below.
Under Age of 18 Over Age of 18
n1 = 500
If you choose to solve these problems, please show the steps and formulas used.
1. A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is
Please show the working behind the correct choice.
The new owner of a beauty shop is trying to decide whether to hire one, two, or three beauticians. She estimates that profits next year (in thousands of dollars) will vary with demand for her services and has estimated demand in three categories: low, medium and high.
NUMB
Please select the correct answer and explain briefly why:
1. In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels, 20 heart patients' cholesterol levels are measured before they are given the drug. The same 20 patients use XZR for two continuous months. After two months of continuous u
General Questions on Probability and Analysis of Variance.
STATISTICS QUESTIONS:
1. Which of the following is a correct statement about a probability?
a. Probability values range from 0 to 1, inclusive.
b. Probabilities may assume negative values.
c. Probabilities may be greater than 1.
d. Probabilities are limited to
