Apple stock jumped along with other tech shares Thursday, as markets cheered the Federal Reserve’s big interest-rate cut. Still, one strong day for the iPhone maker shouldn’t cloud the uncertainty ahead.

Shares of Apple Inc. rose 3.71% to $228.87 Thursday, on what proved to be an all-around favorable trading session for the stock market, with the NASDAQ Composite Index rising 2.51% to 18,013.98 and the Dow Jones Industrial Average rising 1.

Decades of market research shows that the best stocks tend to have an RS Rating of at least 80 in the early stages of their moves. See if Apple stock can continue to rebound and c