A newly installed automatic gate system was being tested to see if the number of failures in 1,000 entry attempts was the same as the number of failures in 1,000 exit attempts. A random sample of eight delivery trucks was selected for data collection. Do these sample results show that there is a significant difference between entry and exit gate failures? Use $\alpha=.01$.

$$\begin{array}{lcccccccc} \hline & \text { Truck 1 } & \text { Truck 2 } & \text { Truck 3 } & \text { Truck 4 } & \text { Truck 5 } & \text { Truck 6 } & \text { Truck 7 } & \text { Truck 8 } \\ \hline \text { Entry failures } & 43 & 45 & 53 & 56 & 61 & 51 & 48 & 44 \\ \text { Exit failures } & 48 & 51 & 60 & 58 & 58 & 45 & 55 & 50 \\ \hline \end{array}$$

Showing concentrations of a contaminant, purposely unnamed here, in groundwater, to shade in areas where there is contamination. Use darker shades for higher levels of contamination

The pancreas

$$\textbf{\ \ a.}\text{ secretes insulin.}$$

$$\textbf{\ \ b.}\text{ secretes glucagon.}$$

$$\textbf{\ \ c.}\text{ helps regulate blood glucose levels.}$$

$$\textbf{\ \ d.}\text{ all of the above.}$$

Name the first three trophic levels. Among the consumers, which are most abundant? Use the "10% law" to explain why you would predict that there will be greater biomass of plants than herbivores in an ecosystem.

According to the First Law of Air Travel, for each situation below, will the distance to your gate be greater or less for this trip than for your last trip?

You have less luggage.

Suppose that, for a sample of size $n=100$ measurements, we find that $\bar{x}=50$. Assuming that $\sigma$ equals $2$, calculate confidence intervals for the population mean $\mu$ with the following confidence levels:

$$99.73\%$$

Suppose that, for a sample of size $n=100$ measurements, we find that $\bar{x}=50$. Assuming that $\sigma$ equals $2$, calculate confidence intervals for the population mean $\mu$ with the following confidence levels:

$$97\%$$

A newly installed automatic gate system was being tested to see if the number of failures in 1,000 entry attempts was the same as the number of failures in 1,000 exit attempts. A random sample of eight delivery trucks was selected for data collection. Do these sample results show that there is a significant difference between entry and exit gate failures? Use $\alpha$ = .01.

A solid cylinder is released from rest and rolls without slipping down a $4.0^{\circ}$ incline. Two photogates are connected to a timer that measures the elapsed time for the ball to roll between them. If the first gate is $1.00 \mathrm{~m}$ from the starting point and the second is $0.20 \mathrm{~m}$ past the first, what will the timer read?

You are at an ocean beach where it hasn't rained in weeks. You observe that for miles along the beach the sand is saturated with water about 5 feet inland and about 2 feet higher than any recent ocean levels. Describe a common condition that would account for the water-saturated sand above ocean levels. (Don't consider splashing of waves.) [1]

The minimum and maximum sound levels at a rock concert are 90 decibels and 95 decibcls. Which equation models this situation?

(A) $|x-90|=5$

(B) $|x-92.5|=2.5$

(C) $|x-92.5|=5$

(D) $|x-9.5|=2.5$

The number of available nutrients$\rule{1cm}{0.4pt}$from the lower levels of the energy pyramid to the higher ones. a. increases $\hspace{2.13cm}$c. remains stable b. decreases $\hspace{2cm}$d. cycles

A uniform, $4.5$-$\mathrm{kg}$, square, solid wooden gate $1.5$ m on each side hangs vertically from a frictionless pivot at the center of its upper edge. A $1.1$-$\mathrm{kg}$ raven flying horizontally at $5.0$ m$/$s flies into this door at its center and bounces back at $2.0$ m$/$s in the opposite direction./ (b) During the collision, why is the angular momentum conserved but not the linear momentum?

Your ears can accommodate a huge range of sound levels. What is the ratio of highest to lowest intensity at $100 \mathrm{~Hz}$ ? (See Fig. 16-6.).