Aphysicist examines 28 sedimentary samples for nitrate concentration. the mean nitrate concentration for the sample data is 0.443 cc/cubic meter with a standard deviation of 0.0305. determine the 95% confidence interval for the population mean nitrate concentration. assume the population is approximately normal. step 1 of 2 : find the critical value that should be used in constructing the confidence interval. round your answer to three decimal places.

95% confidence interval is (0.432, 0.454) and critical value = 1.96.

Step-by-step explanation:

Since we have given that

Sample size = n = 28

Mean = 0.443

Standard deviation = 0.0305

We need to find the 95% confidence interval.

So, z = 1.96

so, Interval would be

Hence, 95% confidence interval is (0.432, 0.454) and critical value = 1.96.

h who knows

step-by-step explanation:

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions