To fulfill the requirements for a certain degree, a student can choose to take any 7 out of a list of 20 courses, with the const
1 answer:
Complete answer:
Fulfill the requirements for a certain degree, a student can choose to take any 7 out of a list of 20 courses, with the constraint that at least 1 of the 7 courses must be a statistics course. Suppose that 5 of the 20 courses are statistics courses.
(a) How many choices are there for which 7 courses to take?
(b) Explain intuitively why the answer to (a) is not
Answer:
a) 71085 choices
b) See below
Step-by-step explanation:
a) First we're going to calculate in how many ways you can take 7 courses from a list of 20 without the constraint that at least 1 of the 7 courses must be a statistics course, that's simply a combination of elements without repetition so it's: , but now we should subtract from that all the possibilities when none of the courses chose are a statistic course, that's is
because 15 courses are not statistics and 7 are the ways to arrange them. So finally, the choices for which 7 courses to take with the constraint that at least 1 of the 7 courses must be a statistics course are:
b) It's important to note that the constraint at least 1 of the 7 courses must be a statistics course make the possible events dependent, we can not only fix an statistic course and choose the others willingly ( that is what means) because the selection of one course affect the other choices.
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Answer: the slope is -1/15 and it means that the distance from home decreases 1/15 units per minute of walk, which indicates the your are going home.
Explanation:
The equation d = 4 - (1/5)t has these features:
- it is a linear (first degree) equation/
- d is the dependent variable, distance from home.
- t is the independent variable, minutes of walk
- 4 is the constant term and it is the value of d when t = 0, which means that it is the vertical axis intercept and represents the initial distance from home.
- - ( 1/15) is the coefficient of the independent variable, it is the slope of the equation, and means the rate of change of the distance per minute of walk.
- this slope, since it is negative, means that the distance decreases as times goes on. It means that each minute of walk the distance decreases 1/15 unit.
- you can find when the distance is zero, by doing the variable d = 0:
d = 0 = 4 - (1/15)t ⇒ t = 4×15 = 60 min.
The given equation, d = 4 - (1/5)t is a linear equation, whose y-intercept form is y = mx + b.
- m is the slope, therefore it is - 1/15.
- 4 is the y-intercept, therefore it is 4.
The domain of the function is the interval [0, 60], meaning that those are the minutes of the walk.
The range of the function is the interval [4, 0] meaning that the distance goes from 4 to 0 units.
You have plenty information to do the graph:
- label the horizontal axis t in minutes
- do marks at 0, 5, 10, 15, 20, 25, .... up to 60 on the horizontal axis
- lable the vertical axis d
- do marks at 4, 3, 2, 1, on the vertical axis
- draw the points (0, 4) and (60,0)
- draw a segment joining those two points.
You can see the graph in the image attached.
Answer:
Step-by-step explanation:
- A null hypothesis is a type of hypothesis that is used in statistics that assumes there is no difference between particular characteristics of a population wheres the alternative hypothesis shows that there is a difference.
Given: A 37 bag sample had a mean of 421 grams.
Let be the population mean.
Then, the null hypothesis would be:
whereas the alternative hypothesis would be: