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For each of 13 adult nesting birds observed over a 24-hour period, the chart records the number of times the bird left the nest from sunrise to sunset and the number of times the bird left the nest from sunset to sunrise. The chart also shows the trendline for the data.
On the basis of the information provided, select from each of the drop-down menus the option that creates the most accurate statement.
| Text Component | Literal Content | Interpretation |
|---|---|---|
| Subject | 13 adult nesting birds | The dataset covers 13 mature birds that are currently nesting |
| Observation Period | Over a 24-hour period | Each bird was monitored continuously for one day and one night |
| Daytime Data | Number of times the bird left the nest from sunrise to sunset | For each bird, researchers counted how often the nest was left during daylight |
| Nighttime Data | Number of times the bird left the nest from sunset to sunrise | For each bird, researchers counted how often the nest was left during nighttime |
| Trendline | The chart also shows the trendline for the data | A line is drawn on the chart to show the overall data relationship |
| Chart Component | What is Shown | Interpretation |
|---|---|---|
| Chart Type | Scatter plot with trendline | Visualizes the relationship between day and night departures |
| X-axis | Number of times bird left nest, sunset to sunrise (0-10) | Shows nighttime departures for each bird |
| Y-axis | Number of times bird left nest, sunrise to sunset (0-10) | Shows daytime departures for each bird |
| Data Points | 13 black dots (ranging between 1-9 on each axis) | Each dot represents one bird's paired day/night departure values |
| Trendline | Blue line, negative slope (approx. \(\mathrm{y = -0.8x + 8.5}\)) | Indicates a strong inverse relationship between day and night activity |
The dataset reveals a strong negative correlation between the number of daytime and nighttime nest departures among nesting birds: when birds leave the nest more often at night, they tend to leave less often during the day, and vice versa. This pattern, consistently present across all 13 birds, suggests a compensatory behavioral strategy. The maximum recorded departures for any individual bird in either period is 9.
The chart shows [BLANK] correlation between the number of times an adult nesting bird leaves the nest from sunrise to sunset and the number of times that bird leaves the nest from sunset to sunrise.
During this 24-hour observation period, the maximum number of times any of the adult birds left the nest was [BLANK] times.
By analyzing the scatter plot and its trendline, the correlation is negative, meaning as daytime departures increase, nighttime ones tend to decrease. To find the maximum number of departures, we combine day and night values for each bird; the greatest sum is 12, so the answer is 12.
The two questions are independent. The first relates only to the pattern (type of correlation) in the chart, while the second requires arithmetic to find the maximum departure sum for any one bird. Neither answer depends on the other.