To sum up, the conclusion lacks credibility because the evidence cited in the analysis does not lend strong support to what the arguer maintains. To strengthen the argument, the arguer would have to provide more evidence concerning the percentage of the affected families and their geographical distribution.

  As it stands, the argument is not well reasoned. To make it logically acceptable, the arguer would have to demonstrate that … is the only condition that …Additionally, the arguer must provide evidence to rule out other possible causes of the …

  To conclude, this argument is not persuasive as it stands.

  In summary, the conclusion reached in this argument is invalid and misleading.

  In conclusion, the arguer fails to establish a causal relationship between …To strengthen the argument, the arguer would have to provide evidence that …To better evaluate the argument, we would need more information about …