Three stores sell the same Panthers t-shirt.
• At Store A, the shirt is 65% off the regular price of $62.79.
• At Store B, the shirt is 60% off the regular price of $55.65.
• At Store C, the shirt is 45% off the regular price of $42.29.
What is the difference in price between the highest and lowest sale prices?
$0.28
$1.00
$1.28
$1.56

$1.28

Step-by-step explanation:

It’s work to explain but that’s the answer but just do 62.79(1-65%) and so on

Margin of Error = 3.0250

99% Confidence interval for the population mean of blood plasma volume in male firefighters = (31.9750, 38.0250)

We are 99% confident that the true population mean of blood plasma volume in male firefighters is in the range (31.9750, 38.0250)

Step-by-step explanation:

Confidence interval gives a range of values where the mean can be obtained with a certain level of confidence.

Confidence interval = (Sample mean) ± (Margin of error)

Sample mean = 35

Margin of Error = (critical value) × (standard deviation of the distribution of sample means)

Critical value

For the critical value, we will use the t-distribution with a significance level of (0.01/2) and degree of freedom = 41 - 1

α = 0.005

df = 40

t = 2.42 (this is the t-score value, we used the t-distribution because the standard deviation and the mean for the population isn't known)

Standard deviation of the distribution of sample means = σ/√n

where σ = Sample standard deviation = 8

n = sample size = 41

Standard deviation of the distribution of sample means = (8/√41) = 1.25

Margin of error = 2.420 × 1.25 = 3.0250

Confidence interval = (Sample mean) ± (Margin of error) = 35 ± 3.0250

Confidence interval = (31.9750, 38.0250)

Hope this Helps!!!