True or false? Check the boxes corresponding to true statements. The average X bar of a sample cannot be negative. (Standard deviation is s_x, not s^2_x.) Roughly half of the values in a sample should be larger than the median. The mean of a Binomial random variable with one trial.
True or False: I'VE ASKED THESE BEFORE AND SOMEONE POSTED THE RANDOM/INCORRECT ANSWERS. PLEASE ONLY ANSWER IF YOU ARE SURE OF YOUR ANSWERS.
1. For correlation, the data need to be normally distributed in both the vertical and horizontal directions to meet assumptions for the statistical analysis
.
True or false for number 1 and 2?/
In a multiple regression model, the utility of the model cannot be tested with a t test. In regression analysis, the population correlation coefficient rho is always between 0 and 1..
True or False. Consider a p% confidence interval (CI) for the population mean constructed from a sample of size N. (e.g. if p=95 it's a 95% CI and if p=99 it’s a 99% CI).
1) It will always contain the population mean.
2) It.
True or False. For each of the following situation answer whether the statement is true or false. In all cases you must DEMONSTRATE that it is true or false. A simple one word answer will receive NO CREDIT. If a typesetter makes errors at a rate of .2 errors per.
True or false, if false make the underlined statement true The data warehouse contains information about objects included in the database. Multiple-choice Which of the following statements about a primary key is incorrect? A. It identifies which column uniquely identify each record B. It can be null, as long as.
True or False: It is possible to make both a Type I and a Type II error in a single decision regarding a result of a hypothesis test. Select one: True False.
True or false
a) the dual of the dual problem yields the original primal
b) If the primal constraint is originally in equation form, the corresponding dual variables is necessarily unrestricted.
c) If the primal constraint is of the type <=,.
True or false
A) The P value method makes a decision by comparing the P value and the critical value
B) The critical value is a statistic is calculated using population data
C) The critical value separates the critical region from.
True or False. Probability calculations from a binomial distribution can be found using a Normal approximation for large sample sizes. a. True b. False.
True or False.
1. The magnitude of the correlation indicates the direction of the relationship.
2. A correlation of 1 indicates no relationship between two variables.
3. The SP can never be negative.
4. A correlation of -.4.
True or False: A random process can be thought of as an infinite sequence of random variables, indexed by a "time" variable that may be either discrete or continuous. True False.
True or False: If 1000 different samples were taken and a 99% confidence interval made for each, exactly 990 would contain the true value and 10 would not.
True or False: Given a 90% confidence interval, you know the parameter will be contained in the interval 90%.
True or False:
The relative frequency for a given class is the total of all class frequencies before the class divided by the total number of entries..
True or False
It is desirable, but not necessary, that sample sizes be equal in a one-factor ANOVA
Tukey's test pools all the sample variances
Tukey's test with seven groups would entail 21 comparisons of means.
One-factor ANOVA.
True or false: It is appropriate to state the effect size based on a confidence interval when a null hypothesis is the following.
(a) within the confidence interval
True or False
(b) outside the confidence interval
True or.
True or False
For discrete distributions, "greater than" is, practically speaking, the same as saying "greater than or equal" and P(a X b) = F(b) - F(a).
Please provide an explanation as to why it's true. If it is false, please explain why and.
TRUE OR FALSE
Autocorrelation of the residuals may affect the reliability of the t values for the estimated coefficients of the predictors X1, X2, . . . , Xk..
True or false (circle one): Two events A and B are independent if the occurrence of one does not affect the probability of the occurrence of the other. If A and B are not independent, they are said to be dependent.].
True or false? If the sample mean x of a random sample from an x distribution is relatively small, when the confidence level c is reduced, the confidence interval for becomes shorter.
False. As the level of confidence decreases, the maximal error of estimate increases.
.
TRUE or FALSE. Please indicate how confident you are in your answer.
For a binomial data set, if p=.1 and n = 4, the distribution will look approximately normal if enough samples are taken..
True or False: A 1-in-k systematic sample involves the random selection of one of the first k elements in an ordered population, and then the systematic selection of every kth element thereafter..
True or False. Justify for full credit.
(a) A is an event, and Ac is the complement of A, then P(A OR Ac ) = 0.
(b) If the variance of a data set is 0, then all the observations in this data set.
True or False: Both of the following if statements perform the same operation.
1. if (sales > 10000)
commissionRate = 0.15;
2. if (sales > 10000) commissionRate = 0.15;.
True or False Researchers are interested in whether two therapeutic alternatives yield different response rates. Assuming they are willing to tolerate a 1% type I error rate, if it is observed that one therapy has a response rate 24 percentage points higher than the other with a standard error of.
True or false
A negative Z score lives to the right of the mean? T or F explain in two sentences.
To construct a uniform distribution, it is necessary to know that total number of trials in the probability of success on each trial?.
true or false
a simple random sample of sizw n from a population of size N is a sample selected such that each possible sample of size n has a probability of .5 of being selected.
True or False:
a) In a contingency table, when all the expected frequencies are equal the oberved frequencies the calculaed chi squared statistic equals zero.
b) In performing a chi-square test of independence, as teh difference between the respective observed and expected frequencies decrase,.
True or False, explain. Factors that may allow one to model a control volume as having negligible (zero) heat transfer include (1) the outer surface of the control volume is well insulated, (2) the outer surface area of the control volume is too small to permit effective heat transfer, (3).
True or False Circle only one response. a) T/F It is possible for the sum of probabilities for all the sample points of a sample space to be less than one. b) T/F A binomial experiment always has at least two possible outcomes for each trial. c) T/F If the.
