In the 3 to 4 years before 1995, PCs went from a hobbyist toy to use by roughly 40 to 50 million people.

Judged against what was known about PC adoption around 1991–1995. True: credible data show that around 1995 roughly 40–50 million people were using PCs (in the US, or whatever scope the full statement makes clear), and that PCs had been seen mainly as a hobbyist or niche item only about 3–4 years earlier. Mostly true: the user count was roughly in range (about 35–60 million), but the 'hobbyist toy' period was further back than 3–4 years (for example, the late 1970s or early 1980s), which is a detail the main point does not depend on. Mixed: either the user count or the timeline is badly off while the other holds. Mostly false: the user count was far off (for example, below about 25 million or many times larger), or PCs were already in wide business use well before 1991, so the 'hobbyist toy to mass use in 3–4 years' story distorts what happened. False: both the count and the timeline are clearly wrong.

Set before the research began.

1. E1 Survey Monitor April 1995 | Articles Quirk's Marketing Research Review · April 1995

   “By 1997, 42 million PCs will be humming away in American homes, up from 23 million today.”

2. E2 Survey Monitor April 1995 | Articles Quirk's Marketing Research Review · April 1995

   “Don't believe the hype that more than 30 percent of U.S. households own personal computers. A recent People & Technology Strategies report from Forrester Research contends that only 20 percent of U.S. families now use home PCs.”

3. E3 Personal Computer Not Yet in Every Pot The Christian Science Monitor · 14 August 1991

   “In the year it was introduced, there were 1.7 million personal computers in the United States. By the end of this year, International Data Corporation estimates there will be 59.2 million such machines.”

4. E4 Personal Computer Not Yet in Every Pot The Christian Science Monitor · 14 August 1991

   “Walk into an office or bank in any developed nation and you're likely to find personal computers at work.”

The evidence shows wide office use of PCs by 1991 [E4] and an estimated 59.2 million PCs in the US in 1991 [E3], but that figure counts machines, not users. No item shows wide business use well before 1991 or a user count far from 40–50 million. The evidence therefore does not settle which band of the criteria applies.