reject the claim that the lab technician’s accuracy is within the target accuracy?
Compute the value of the appropriate test statistic.
A.z = 1.65
B.t = 27.50
C.
= 30.58
D.
= 27.50
Answer Key: D

Question 9 of 20
1.0/ 1.0 Points
Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after
graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does
this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance.
What is your conclusion?

Question 10 of 20
1.0/ 1.0 Points
A null hypothesis can only be rejected at the 5% significance level if and only if:

D.a 95% confidence interval does not include the hypothesized value of the parameter
Answer Key: D
Question 11 of 20
0.0/ 1.0 Points
A manufacturer of flashlight batteries took a sample of 13 batteries from a day’s production and used them continuously
until they failed to work. The life lengths of the batteries, in hours, until they failed were: 342, 426, 317, 545, 264,
451, 1049, 631, 512, 266, 492, 562, and 298.
At the .05 level of significance, is there evidence to suggest that the mean life length of the batteries produced by
this manufacturer is more than 400 hours?

Part 2 of 3 -
4.0/ 6.0 Points
Question 12 of 20
0.0/ 1.0 Points
Accepted characters
: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific notation).
NOTE:
For scientific notation, a period MUST
be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Suppose a firm that produces light bulbs wants to know whether it can say that its light bulbs typically last more
than 1500 hours. Hoping to find support for their claim, the firm collects a random sample of n = 25 light bulbs and
records the lifetime (in hours) of each bulb. The information related to the hypothesis test is presented below.

Test of H
0
:
1500 versus H
1
:
> 1500
Sample mean 1509.5
Std error of mean 4.854
Assuming the life length of this type of lightbulb is normally distributed, what is the p-value associated with this