NEW YORK (TheStreet) -- The Utilities Select Sector SPDR Fund (XLU) - Get Report and the iShares Transportation Average ETF (IYT) - Get Report represent two of the three worst-performing sectors for the first half of 2015. But that changed in July.

The utilities exchange-traded fund mirrors the Dow Jones Utility Average, which is down 6.3% year to date but remains in correction territory down 11.4% from its all-time intraday high set on Jan. 29. The ETF is down 7.8% year to date but has a gain of 5% in July, and has a dividend yield of 3.7%.

The transportation ETF mirrors the Dow Jones Transportation Average which is down 7.9% year to date but has just moved back above the correction threshold down 9.6% since setting its all-time intraday high back on Nov. 28. The ETF is down 8% year to date but has a gain of 4.1% in July.

Let's illustrate how investors can use must see daily and weekly and key trading levels to help make investment decisions for these ETFs.

Here's the daily chart for the utilities ETF.


Courtesy of MetaStock Xenith

Image placeholder title

The utilities ETF had a close of $43.55 on Thursday, down 7.8% year to date but up 5% in July. The 50-day simple moving average fell below the 200-day simple moving average on April 29 in a formation technicians call a "death cross". The ETF has moved above its 50-day SMA now at $43.02. If this key level holds the upside is to the 200-day SMA now at $44.95.

Here's the weekly chart for the utilities ETF.


Courtesy of MetaStock Xenith

Image placeholder title

The weekly chart for utilities ETF will have a positive weekly chart if the close on Friday, July 31 is above its key weekly moving average of $43.06. The weekly momentum reading is projected to be 35.96 this week up from 30.88 on July 24. If the rally fails the downside risk is to the 200-week simple moving average rising each week, now at $39.44.

Investors looking to buy the utilities ETF should place a good till canceled limit order to buy the ETF if it drops to $41.17 and $38.18, which are key levels on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit to sell the EFT if it rises to $46.05 and $46.31, which are key levels on technical charts until the end of 2015 and September, respectively.

Here's the daily chart for the transportation ETF.


Courtesy of MetaStock Xenith

Image placeholder title

The transportation ETF had a close of $150.95 on Thursday, down 8% year to date, but up 4.1% in July. The 50-day simple moving average fell below the 200-day simple moving average on May 26 in a formation technicians call a "death cross". The ETF has moved above its 50-day SMA now at $148.98. If this key level holds the upside is to the 200-day SMA now at $156.45.

Here's the weekly chart for the transportation ETF.


Courtesy of MetaStock Xenith

Image placeholder title

The weekly chart for the transportation ETF will have a positive weekly chart it the close on Friday, July 31 is above its key weekly moving average of $149.15. The weekly momentum reading is projected to be 23.97 this week up from 19.17 on July 24, which pulls the ETF above the oversold threshold of 20.00. If the rally fails the downside risk is to the 200-week simple moving average rising each week, now at $121.15.

Investors looking to buy the transportation ETF should place a good till canceled limit order to buy the ETF if it drops to $130.34, which is a key level on technical charts until the end of 2015.

Investors looking to reduce holdings should place a good till canceled limit to sell the ETF if it rises to $177.56, which is a key level on technical charts until the end of September.

A semiannual technical level of $150.92 was tested at the highs Wednesday and Thursday and should act as a magnet until the end of 2015.

Investors not familiar with technical analysis should begin with the notion that a price chart for a stock shows a road map of past price performance, which provides guidance for predicting future share price direction.

Here's how to read a daily chart. There are two moving averages to follow; the 50-day simple moving average is in blue while the 200-day simple moving average is in green.

Here's how to read a weekly chart. The red line tracks the ups and downs of the key weekly moving average. The green line is the 200-week simple moving average. The red line that oscillates along the bottom of the chart is the momentum reading on a scale of 00.00 to 100.00. A reading below 20.00 is oversold and a reading above 80.00 is overbought.

A technically positive weekly chart occurs when a stock ends a week above its key weekly moving average with the momentum reading rising above 20.00.

A technically negative weekly chart occurs when a stock ends a week below its key weekly moving average with the momentum reading declining below 80.00.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.