I can provide you with a sample API query in Python that you can use to retrieve Bollinger Bands data from the Alpha Vantage API for a specific stock over a week and return the last 5 data points. You will need to replace `'YOUR_API_KEY'` with your actual Alpha Vantage API key and specify the stock symbol in place of `'YOUR_STOCK_SYMBOL'`.

```python
import requests

# Replace 'YOUR_API_KEY' with your Alpha Vantage API key
api_key = 'YOUR_API_KEY'

# Specify the stock symbol for which you want to retrieve Bollinger Bands data
symbol = 'YOUR_STOCK_SYMBOL'

# Define the API URL
url = f'https://www.alphavantage.co/query'
function = 'BBANDS'
interval = 'daily'
time_period = '7'
series_type = 'close'
apikey = api_key

# Define the parameters for the API request
params = {
    'function': function,
    'symbol': symbol,
    'interval': interval,
    'time_period': time_period,
    'series_type': series_type,
    'apikey': api_key
}

# Send the API request
response = requests.get(url, params=params)

# Check if the request was successful
if response.status_code == 200:
    data = response.json()
    
    # Extract the last 5 data points
    last_5_data_points = data['Technical Analysis: BBANDS'][list(data['Technical Analysis: BBANDS'].keys())[:5]]
    
    # Print the last 5 data points
    print(last_5_data_points)
else:
    print(f"Error: Unable to retrieve data. Status code {response.status_code}")
```

Make sure to replace `'YOUR_API_KEY'` and `'YOUR_STOCK_SYMBOL'` with your actual API key and the stock symbol you want to query. This code uses the Alpha Vantage API to retrieve Bollinger Bands data for the specified stock symbol over a week and then extracts the last 5 data points for you.
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