Question 15 of 20
1.0/ 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.
A firm that produces light bulbs claims that their lightbulbs last 1500 hours, on average. You
wonder if the average might differ from the 1500 hours that the firm claims. To explore this
possibility you take a random sample of n = 25 light bulbs purchased from this firm and record
the lifetime (in hours) of each bulb. You then conduct an appopriate test of hypothesis. Some of
the information related to the hypothesis test is presented below.
Test of H
0
:
= 1500 versus H
1
:
1500
Sample mean 1509.5
Sample standard deviation 24.27
Assuming the life length of this type of lightbulb is normally distributed, if you wish to conduct
this test using a .05 level of significance, what are the critical values that you should use? Place
the smallest critical value, rounded to 3 decimal places, in the first blank. For example, -1.234
would be a legitimate entry.
-2.064
. Place the larger critical value, rounded to 3
decimal places, in the second blank. For example, 1.234 would be a legitimate entry.
2.064

Question 16 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.

A survey determines that mint chocolate chip is the favorite ice cream flavor of 6% of
consumers. An ice cream shop determines that of 240 customers, 18 customers stated their
preference for mint chocolate chip.
Find the P-value that would be used to determine if the percentage of customers who prefer mint
chocolate chip ice has increased at a 5% level of significance.
P-value:
Round your answer to four decimal places as necessary.