TABLE 13-3
The director of cooperative education at a state college wants to examine the effect of
cooperative education job experience on marketability in the work place. She takes a
random sample of 4 students. For these 4, she finds out how many times each had a
cooperative education job and how many job offers they received upon graduation.
These data are presented in the table below.
Referring to Table 13-3, suppose the director of cooperative education wants to
construct a 95% confidence interval estimate for the mean number of job offers
received by students who have had exactly one cooperative education job. The
confidence interval is from ________ to ________.
Referring to Table 14-4, the value of the partial F test statistic is ________ for
H0 : Variable X1 does not significantly improve the model after variable X2 has been
included
H1 : Variable X1 significantly improves the model after variable X2 has been included
TABLE 14-4
A real estate builder wishes to determine how house size (House) is influenced by
family income (Income) and family size (Size). House size is measured in hundreds of
square feet and income is measured in thousands of dollars. The builder randomly
selected 50 families and ran the multiple regression. Partial Microsoft Excel output is
provided below:
Also SSR (X1∣ X2) = 36400.6326 and SSR (X2∣ X1) = 3297.7917
TABLE 4-3
A survey is taken among customers of a fast-food restaurant to determine preference for
hamburger or chicken. Of 200 respondents selected, 75 were children and 125 were
adults. 120 preferred hamburger and 80 preferred chicken. 55 of the children preferred
hamburger.
Referring to Table 4-3, the probability that a randomly selected individual is a child and
prefers chicken is ________.
TABLE 3-4
The ordered array below represents the number of cargo manifests approved by customs
inspectors of the Port of New York in a sample of 35 days:
16, 17, 18, 18, 19, 20, 20, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 25, 25,
26, 26, 26, 27, 28, 28, 29, 29, 31, 31, 32, 32
Note: For this sample, the sum of the values is 838, and the sum of the squared
differences between each value and the mean is 619.89.
Referring to Table 3-4, the interquartile range of the customs data is ________.
TABLE 18-8
Recently, a university switched to a new type of computer-based registration. The
registrar is concerned with the amount of time students are spending on the computer
registering under the new system. She decides to randomly select 8 students on each of
the 12 days of the registration and determine the time each spends on the computer
registering. The range, mean, and standard deviation of the times required to register are
in the table that follows.
Referring to Table 18-8, an R chart is to be constructed for the time required to register.
The upper control limit for this data set is ________.
TABLE 8-11
A poll was conducted by the marketing department of a video game company to
determine the popularity of a new game that was targeted to be launched in three
months. Telephone interviews with 1,500 young adults were conducted which revealed
that 49% said they would purchase the new game. The margin of error was 3
percentage points.
Referring to Table 8-11, what is the needed sample size to obtain a 95% confidence
interval in estimating the percentage of the targeted young adults who will purchase the
new game to within 5%?
You were told that the amount of time lapsed between consecutive trades on the New
York Stock Exchange followed a normal distribution with a mean of 15 seconds. You
were also told that the probability that the time lapsed between two consecutive trades
to fall between 16 to 17 seconds was 13%. The probability that the time lapsed between
two consecutive trades would fall below 13 seconds was 7%. The probability is 20%
that the time lapsed will be shorter than how many seconds?