Answer:
y= 6x - 5
Step-by-step explanation:
 
        
             
        
        
        
Answer:
a) ![[-0.134,0.034]](https://tex.z-dn.net/?f=%5B-0.134%2C0.034%5D)
b) We are uncertain
c) It will change significantly
Step-by-step explanation:
a) Since the variances are unknown, we use the t-test with 95% confidence interval, that is the significance level = 1-0.05 = 0.025.
Since we assume that the variances are equal, we use the pooled variance given as
 ,
,
where  .
.
The mean difference  .
.
The confidence interval is 

![= -0.05\pm 1.995 \times 0.042 = -0.05 \pm 0.084 = [-0.134,0.034]](https://tex.z-dn.net/?f=%3D%20-0.05%5Cpm%201.995%20%5Ctimes%200.042%20%3D%20-0.05%20%5Cpm%200.084%20%3D%20%5B-0.134%2C0.034%5D)
b) With 95% confidence, we can say that it is possible that the gaskets from shift 2 are, on average, wider than the gaskets from shift 1, because the mean difference extends to the negative interval or that the gaskets from shift 1 are wider, because the confidence interval extends to the positive interval.
c) Increasing the sample sizes results in a smaller margin of error, which gives us a narrower confidence interval, thus giving us a good idea of what the true mean difference is.
 
        
             
        
        
        
Answer:
14.2 feet 
Step-by-step explanation:
I rounded off to 1 decimal place 
 
        
             
        
        
        
Answer:
the square root of 5=2.2361 
 
        
             
        
        
        
If x is the amount that Tanya paid for each item, then Tony's items would be x-2.25. So:
 3x=4(x-2.25)
 3x=4x-9
 x=9
 x-2.25=6.75
 Tanya spent $9 on each item; Tony spent $6.75 on each of his items