Ask question

Ask question

All categories

2 years ago

9

The table shows the shipping costs for items of different values. A 2-column table with 4 rows. The first column is labeled tota

l cost of items (in dollars) with entries 25, 45, 50, 70. The second column is labeled shipping costs (in dollars) with entries 5.99, 8.99, 8.99, 10.99. Which best describes the strength of the model? a weak positive correlation a strong positive correlation a weak negative correlation a strong negative correlation

2 answers:

Lisa [10]2 years ago

4 0

A strong positive correlation.

Step-by-step explanation:

The question requires you to calculate the correlation coefficient and then make a conclusion about its value.

Form a table as shown where x is cost of items and y is shipping cost

x y xy x² y²

25 5.99 149.8 625 35.9

45 8.99 404.6 2025 80.8

50 8.99 449.5 2500 80.8

70 10.99 769.3 4900 120.8

190 34.96 1773.2 10050 318.3 ------sum

The formula for correlation coefficient follows;

r=n(∑xy)-(∑x)(∑y) ÷ √{[n∑x²-(x)²] [n∑y²-(y)²]}

where n=4

r=4(1773.2)-(190)(34.96) ÷ √{[4(10050)-190²] [4(318.3)-34.96²]}

r=450÷ √{4100*51)

r=450÷√209100

r=450÷457.3

r=0.98409

The value of r indicates a stronger positive correlation

Learn More

Correlation coefficient :brainly.com/question/12528676

Keywords :shipping costs,cost of items, strength of the model

#LearnwithBrainly

krok68 [10]2 years ago

3 0

Answer:

B

Step-by-step explanation:

a strong positive correlation

You might be interested in

a linguist had a gross income of $53,350 last year if 17.9% of his income got withheld for federal income tax how much of the li

laila [671]

Answer:

The linguists paid $9,549.65 in federal taxes.

Step-by-step explanation:

7 0

1 year ago

good job on increasing our team sales from 90 to 130 units per day.” wow i never thought that we could increase our sales by

artcher [175]

The sales was increased by 44.4%.

Step-by-step explanation:

Lets do this cumulative
90 of 10 % = 9 which is 99
90 of 10 % = 9 which is 108
90 of 10% = 9 which is 117
90 of 10% = 9 which is 126
90 of 4 % = 3.6 which is 129.6
90 of 0.044% = 0.0396 which is 129.99
This comes to nearly 44.44 to be closer there was an increase.
Always rule 1 approximation use 50% of 90 if it is above 130.
Down it to 40% of 90 see if the sales is lower than 130.
It should always start with 50,40,30....10 percents.
Alternative should be 10,1 or decimals.
Approximation using decimals rounding up becomes simple.

7 0

1 year ago

A middle school band has 45 sixth and seventh graders The ratio of sixth to seventh graders is 2 to 3 how many sixth graders are

AnnyKZ [126]

Answer:

18

Step-by-step explanation:

There are 2+3 = 5 ratio units representing 45 band members, so each ratio unit represents 45/5 = 9 band members.

The 2 ratio units of sixth graders represent 2×9 = 18 sixth grade band members.

5 0

2 years ago

Two new drugs are to be tested using a group of 60 laboratory mice, each tagged with a number for identification purposes. Drug

lakkis [162]

Answer:

4.979044478499338 × 10²⁶

Step-by-step explanation:

Combination can be used to determine the number of ways the mice can be selected for the drugs (A, B) and the control group.

Combination factorial is define by ⁿCr = $\frac{n!}{(n-r)!r!}$

21 group of mice receiving Drug A can be selected in ⁶⁰C₂₁ = $\frac{60!}{21!39!}$

(60 - 21 = 39 ) mice remained for selection of 21 mice for the second drug

Drug B 21 mice can be chosen with ³⁹C₂₁ = $\frac{39!}{21!18!}$

( 39 - 21 = 18) remained for control with ¹⁸C₁₈ = $\frac{18!}{18!0!}$

The number of ways the mice can be chosen for drug A, drug B and the control = ⁶⁰C₂₁ × ³⁹C₂₁ × ¹⁸C₁₈ = $\frac{60!}{21!39!}$ × $\frac{39!}{21!18!}$ × $\frac{18!}{18!0!}$ = 4.979044478499338 × 10²⁶

8 0

1 year ago

Jason Witten's Salary Negotiation Let's say that tight end Jason Witten (a football player) was given two options when negotiati

Leokris [45]

Answer:

Option 1: It is better for him to be paid per catch, starting with 1 cent and doubling with each catch up to 110

Explanation:

If Jason were to be paid per catch given that he makes a total of 110 catches for the 2017 season in his new contract, he would make a total of :

0.01 × 2^109 = $6.4903711e+30(calculator result, means 6 then 30 digits after)

Therefore it is better for Jason to be paid per catch and not a flat fee of $2000000

3 0

1 year ago