A builder buys bricks at the rate of $4.50 per brick for the first 10, $3.50 per brick for the next 10, and $2.50 for any additi
onal bricks. how many bricks can be bought for $100?
1 answer:
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Answer:
M=2,179.29
The average exceeds the estimate
Her expenses would need to be $1,625.00
Step-by-step explanation:
1.) What is the mean of her friends' personal expenses?
The mean is defined as the average expense value, calculated as follows:
2.) Is the average higher or lower than the estimate?
Given the estimate of $2,110, the average is indeed higher than this estimate.
3.)What amount of personal expenses would Ashley need to maintain a combined average of $2,110 with her friends' amounts for that school year?
Her needed amount of expenses would be $1,625.00.
Answer:
a) Slope:
Intercept:
b)
Additionally, the coefficient of determination is
Step-by-step explanation:
Definitions and data provided
The correlation coefficient is a measure that quantifies the strength of the relationship between two variable movements, denoted as r and ranging between -1 and 1.
The sum of squares refers to the total of the squared deviations, where deviation is defined as the difference between each value and the grand mean.
When performing multiple regression, the aim is to analyze the relationship between multiple independent variables and one dependent variable.
n=110,
Part a
The slope can be calculated using this formula:
Following the substitutions, we have:
The intercept can be determined with this formula:
Average values for x and y can be calculated this way:
Replacing yields:
Part b
The correlation coefficient can be calculated using the following formula:
In our situation:
n=110,
We can compute the correlation coefficient by substituting values:
The coefficient of determination is