Answer:
45
Step-by-step explanation:
Given that the number of savory dishes is 9 and the number of sweet dished is 5.
Denoting all the 9 savory dishes by 
, and all the sweet dishes by 
.
The possible different mix-and-match plates consisting of two savory dishes are as follows:
There are 9 plates with 
from sweet plates which are 
There are 9 plates with 
from sweet plates which are 
Similarly, there are 9 plated for each 
and 
Hence, the total number of the different mix-and-match plates consisting of two savory dishes
Answer:
An average of 60mph.
Step-by-step explanation:
The average is the mean.
(50 + 70)/2 = 60
Please mark Brainliest if this helps!
Answer:
Because it increases the risk of Type 1 error
Step-by-step explanation:
ANOVA is the analysis of the variance .
When comparing more than two treatment means we use ANOVA because a t test increases the risk of type 1 error .
For example if we wish to compare 4 population means there will be 4C2 = 6 separate pairs and to test the null hypothesis that all four population means are equal would require six two sample t test. Similarly to test 10 population mean would require 45 separate two sample t test.
This has two disadvantages .
First the procedure is too lengthy and tediuos.
Second the overall level of significance greatly increases as the number of t- tests increases.
The analysis of the variance compares two different estimates of variance using the F distributionto determine whether the population means are equal.
Answer:
(a) 7/15
(b) 1/3
Step-by-step explanation:
(a) teaching:
(3 1/2) / (7 1/2) = (7/2) / (15/2) = 7/2 * 2/15 = 7/15
(b) marking:
(2 1/2) / (7 1/2) = (5/2) / (15/2) = 5/2 * 2/15 = 5/15 = 1/3
