Can you do a causal study when much of the primary data collected is descriptive opinion and ordinal or interval data?

PLEASE explain detailed this question, ive seen other answers but is not really what im looking for, thanks!

The Scenario

What government policies and initiatives are most likely to generate high levels of entrepreneurial activity? Which are positively correlated with the economic well-being of a country as measured by growth in GDP and job formation? Project directors of the Global Entrepreneurship Monitor (GEM), who define entrepreneurship as any attempt

at new business or new venture creation, such as self-employment, a new business

organization, or the expansion of an existing business, by an individual, a team of individuals, or an established business, suggest the following:

• Promoting entrepreneurship, especially outside the most active age group (25 44), with specific programs that support entrepreneurial activity.
• Facilitating the availability of resources to women to participate in the

entrepreneurial process.

• Committing to long-term, substantial postsecondary education, including training programs designed to develop skills required to start a business.
• Emphasis on developing an individuals capacity to recognize and pursue new

opportunities.

• Developing the capacity of a society to accommodate the higher levels of income disparity associated with entrepreneurial activity.
• Creating a culture that validates and promotes entrepreneurship throughout

society.

Researchers at the Kauffman Center for Entrepreneurial Leadership (Babson College) and the London Business School revealed these propositions based on a study designed to prove a causal relationship between factors that affect entrepreneurial opportunities and potential, to business dynamics and national economic growth and well-being.

The Research

The research design compensated for lack of control of extraneous variables

by using data from 9 nations with diversity in framework conditions, entrepreneurial sectors, business dynamics, and economic growth. The longitudinal study

proposed to prove or disprove a new conceptual model of cultural, economic, physical, and political factors to predict economic growth (Exhibit C-GEM 11).

Various data collection methods were employed, including:

• Promoting entrepreneurship, especially outside the most active age group (25 44), with specific programs that support entrepreneurial activity.
• Current, nonstandardized data collected by each national research team.
• Two rounds of adult population surveys (1,000 randomly selected adults per country) to measure entrepreneurial activity and attitude, completed and coordinated by an international market survey firm by phoneor face-to-face in Japan. (Market Facts [Arlington, VA] did the first round of data collection in June 1998 [Canada, Finland, Germany, the United Kingdom, and the United States]. Audience Selection, Ltd. [London] conducted the second round in March 1999 from all 10 countries.)
• Hour-long personal interviews with 4 to 39 experts (key informants) in each country.
• Detailed 12-page questionnaire completed by each key informant.

The perception of opportunity (.79) and the two measures of entrepreneurial potential of the populationcapacity (.64) and motivation (.93)positively correlate with business start-up rates. And start-up rates positively correlate with growth in GDP (.60) and level of

employment (.47).

While many cross-sectional measures still remain in this ongoing study, study directors claim, The support for the conceptual model is encouraging, although clearly not

conclusive. GEM provides a robust framework within which national governments can evolve a set of effective policies for enhancing entrepreneurship.