What test do we use if population variances are known?
Answer: z-test: two sample for means
Showing posts with label Data Analytics. Show all posts
Showing posts with label Data Analytics. Show all posts
What is an alternative step to the critical value comparison?
What is an alternative step to the critical value comparison?
Answer: compare the p-value to alpha
What do we do if the test statistic is in the non rejection region?
What do we do if the test statistic is in the non rejection region?
Answer: We fail to reject the null hypothesis
What do we do if the test statistic falls into a rejection region?
What do we do if the test statistic falls into a rejection region?
Answer: we reject the null hypothesis
What does the critical value do?
What does the critical value do?
Answer: Divides the sampling distribution into a rejection region and a non rejection region
How do know if we reject or fail to reject?
How do know if we reject or fail to reject?
Answer: We need to compare the test statistic to the critical value
We want the power of the test to be ___.
We want the power of the test to be ___.
Answer: High
The use of data to understand past and current business performance and make well informed decisions
The use of data to understand past and current business performance and make well informed decisions
Answer: Descriptive analytics
Getting a list of objects in the current workspace is done using what command?
Getting a list of objects in the current workspace is done using what command?
Answer: obj()
Which of the following will produce the square root of the number 65?
Which of the following will produce the square root of the number 65?
Answer: sqrt(65)
What is the c() function in R?
What is the c() function in R?
Answer: Concatenate (combine)
What assigned the calculation 4 multiples by 3 to the variable z?
What assigned the calculation 4 multiples by 3 to the variable z?
Answer: z<-4*3
If you want to plot a bar chart, which of the following functions would you use?
If you want to plot a bar chart, which of the following functions would you use?
Answer: plot
In order to add rows to a data frame, which function is the most appropriate?
In order to add rows to a data frame, which function is the most appropriate?
Answer: rbind
To compare two means, what is the best function to use?
To compare two means, what is the best function to use?
Answer: t.test
What is the value of the expression 2+NA
What is the value of the expression 2+NA
Answer: NA
To select two columns from a data frame called Clients, which of the following expressions is correct?
To select two columns from a data frame called Clients, which of the following expressions is correct?
Answer: Clients[,c(1,2)]
The expression 2**4 returns
The expression 2**4 returns
Answer: 16
When a query is successfully executed in Microsoft SQL Server Management Studio, the number of rows in the query result is indicated:
When a query is successfully executed in Microsoft SQL Server Management Studio, the number of rows in the query result is indicated:
Answer: on the right end of the yellow bar at the bottom of the screen
In SSMS, when viewing the list of columns for a table in the object explorer, the field that if the primary key is identified by
In SSMS, when viewing the list of columns for a table in the object explorer, the field that if the primary key is identified by
Answer: an upside down yellow key to the left of the field and "PK" in parentheses to the right of the field
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