Round your answer to four decimal places as necessary.

Question 13 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
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 is the critical value that you should use? Place
your answer, rounded to 3 decimal places in the blank. For example, 1.234 would be a legitimate
entry.
1.957

Comment: 1.711
Question 14 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.
Let x be a random variable representing dividend yield of Australian bank stocks. We may
assume that x has a normal distribution with
= 2.8%. A random sample of 16 Australian bank
stocks has a sample mean dividend yield of 8.91%. For the entire Australian stock market, the
mean dividend yield is
= 6.4%. If you wanted to test, at a .05 level of significance, to
determine if these data indicate that the dividend yield of all Australian bank stocks is higher
than 6.4% what is the critical value that you would use? Place your answer, rounded to 2
decimal places, in the blank. For example, 2.34 would be a legitimate entry.
1.65

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 survey determines that mint chocolate chip is the favorite ice cream flavor of 6% of
consumers. An ice cream shop determines that of 260 customers, 20 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:
0.1253
Round your answer to four decimal places as necessary.