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Stats final

Terms in this set (56)

Which of the following is used to illustrate the "best guess" as to the predicted Y variable score based on X?
Regression Line
In order to be 95% confident you have not committed a Type I error, at what level should you set your p value?
.05
You select 87 patients receiving a MRI at your hospital and find that the average time in a MRI is 45 minutes with a standard deviation of 10. What is the estimated range of MRI time (in minutes) per patient (the population) if you wish to be 95% confident? (Hint: Use Excel's Confidence Interval Function)
42.9 and 47.1
A Type I error is committed when
we reject a null hypothesis that is true
What statistical technique is used to make predictions of the future outcomes based on present data?
Linear regression
When examining group difference where no direction of the difference is specified, which of the following is used?
Two-tailed test
If the obtained value is greater than the critical value, what should you do?
Reject the null hypothesis
Which of the following is the most commonly used nonparametric test?
t-test
If there were 2 deaths among 1700 women discharged for the obstetrical service, what was the maternal death rate?
.12%
What types of diseases are reported to the Public Health Department?
communicable
If you have 30 respondents identifying their political preference, what would be the expected frequency for each category?
10
When we find no difference between the actual value and the value to which we are comparing it, when in fact there was a difference, we have committed a
Type II error
The hypothesis that directly evaluated the statistical test is called the
research hypothesis
When testing difference in the means of three groups simultaneously, you would use which of the following statistical tests?
ANOVA
A positive trend line is associated with what type of slope?
positive slope
Based on the following information, what was the gross death rate at City Hospital?
In April, City Hospital, with a bed count of 250 and 25 bassinets, rendered 6912 inpatient service days (6319 to adults and children and 593 to newborn) and 8112 days of care to discharged patients (7487 to adults and children and 625 to newborn.) There were 120 births and 775 adult and child admissions. 995 patients were discharged (958 alive, 8 deaths under 48 hours, and 29 deaths over 48 hours). There were 4 fetal deaths and 2 DOA's. 32 autopsies were performed (26 on hospital deaths, 4 on fetal deaths, and 2 on DOA's).
3.7%
The probability of a Type II error is denoted as a
[β]
In order to determine whether or not you will reject the null hypothesis, the test statistic must be compared against the
critical value
If your statistical value is LESS than the critical value, you would
fail to reject (accept) the null and reject the research hypothesis
Which of the following is the formula for computing the F statistic?
F = MS between/ MS within
If your obtained t value is 6.10 and the critical value is 7.14, what decision should you make?
Fail to reject (accept) the null
If you have 100 respondents identifying their gender, what would be the expected frequency for each category?
50
Which major assumption of the t-test deals with the amount of variability in each group?
Variances are equal
In the formula that computed a t value, what does the Xbar1 represent?
Mean for group 1
A Type II error is committed when
we do not reject a null hypothesis that is false
What is another name for a regression line?
Line of best fit
A one-sample chi-square is also known as which of these?
Goodness of fit test
A null hypothesis is a claim about the
population parameter
Which of the following techniques is used to generalize findings from your sample to the population?
inferential statistics
Computing the between-group variance first calls for summing the difference between the grand mean and the group means. This is known as the
SS between
What must be done to categorical variables in order to use them in a regression analysis?
Dummy coding
The F value tests the ____ between groups.
variability
What can be used as the basis for prediction?
correlation
What is the level of risk associated with the null hypothesis called?
Type I error
A post op death is any death that occurs within how many days following an operation?
10 days
Which of the following is the correct formula for linear regression?
Y`=bX+a
Step 1 of the hypothesis testing steps includes the hypothesis as well as the
assumptions
The probability of a confidence interval is represented by _____, which is called the degree of confidence.
1 - [α]
When computing the degrees of freedom for ANOVA, how is the between-group estimate calculated?
k -1
The inpatient bed capacity or bed count of a facility includes:
pediatric cribs
When reporting statistical significance, how is it usually represented?
p< 0.05
If you set your significance level at 0.05 and you obtain a probability (p-value) of 0.03, you would
reject the null hypothesis and find support of the research hypothesis
LOS means
Length of Stay
Data derived from the certificated and reports of birth, death, fetal death, induced terminations of pregnancy, marriage, divorce, and related reports are
vital statistics
What is the denominator in the formula for net autopsy rate?
inpatient deaths minus unautopsied coroner's cases
What types of statistics are not governed by the parameters of the population?
nonparametric
What individual is not required to sign the birth certificate?
State health officer
What does the number 2.001 represent in the following: t = 2.001, p < .05?
the obtained value
Using the regression formula with slope = .704 and the intercept = .719, what would the predicted college GPA be for a student whose current high school GPA = 3.2?
2.97
When we find there is a difference between the tested value and the actual value, when in fact there was no difference, we have committed a
Type I error
How many days are allowed to file a Certificate of Live Birth?
5 days
When interpreting F(2,27)= 8.80, p< 0.05, what is the between-group difference?
2
If there are three categories for which you are calculating a one sample chi-square, what are the degrees of freedom?
2
The obtained value must be compared against which of the following?
critical value
When assigning an alpha level as a decision criteria to evaluate the results of a statistical test, which of the following is the most conservative ( the least risk of accepting the alternative hypothesis when in fact there was no difference)?
.01
What is the distance between each data point and the regression line called?
Error of estimate
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